{"title":"Filling colour by COLOURLOCK","description":"\u003ch2 id=\"speakable-headline\"\u003eStabilizing brittle leather with COLOURLOCK Filler\u003c\/h2\u003e\n\n\u003cblockquote id=\"speakable-summary\"\u003e\n\n  \u003cp\u003e\u003cem\u003eWhat is COLOURLOCK Filler? A pigment-free binder for brittle, micro-cracked leather surfaces: COLOURLOCK \"Binder\" (Neutral) penetrates the weakened topcoat of pigmented smooth leather, elastically bonds loose fibers from within, and restores the surface's structural integrity for leather color and topcoat.\u003c\/em\u003e\u003c\/p\u003e\n\n\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003cp id=\"speakable-definition\"\u003e\u003cstrong\u003eFiller\u003c\/strong\u003e is the work step between priming and coloring: a pigment-free, highly elastic binder that holds a brittle leather surface back together. The name is misleading — it does not actually dye anything. The filler fills micro-cracks in the existing pigment layer, binds frayed fibers, and creates the substrate required for leather color to be applied evenly and adhere permanently. At COLOURLOCK, this task is performed by the neutral Binder.\u003c\/p\u003e\n\n\u003cul\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003ePigment-free, therefore invisible.\u003c\/strong\u003e The filler contains no colorants and changes neither the shade nor the gloss level. This means for you: You can apply it to an area that is still color-accurate and you won't see any difference afterwards — except that the surface will feel closed and smooth again instead of rough and fibrous.\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003ePenetrating instead of build-up.\u003c\/strong\u003e A filler adds mass to the surface, but this binder soaks in. It penetrates the broken topcoat, surrounds loose pigment particles, and bonds them flexibly to one another — the repair happens beneath the surface, not on top of it. You can tell because the grain remains visible; nothing looks smeared.\u003c\/li\u003e\n\n  \u003cli\u003e\n\n\u003cstrong\u003eElastic enough for folds.\u003c\/strong\u003e Water-based polyurethane binders for leather achieve elongation at break values exceeding 170 percent, far more than one and a half times their original length. Practically speaking: the stabilized surface moves with every entry and every steering movement instead of tearing back open like a fine net on the first cold morning. Available in 250 ml and 1000 ml \/ 1 liter sizes.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cblockquote class=\"praxistipp\"\u003e\n\n  \u003cp\u003e\u003cstrong\u003eProfessional tip from Detailing1:\u003c\/strong\u003e The most common mistake is already hidden in the term \"filler\" — many people expect a putty and apply it accordingly thick. That is exactly what ruins the result: a heavy layer dries on the outside, remains soft on the inside, becomes gummy, and tears sooner than the leather underneath. We regularly receive inquiries from customers whose refinished seat bolster showed fine cracks again after a few weeks, and almost always the first layer was applied too heavily. The opposite is correct: apply thinly using a sponge, swab, or brush, let it dry briefly, then apply the next layer. Two thin layers are better than one thick one — and if the surface still feels unstable after the second layer, add a third, not a thicker one.\u003c\/p\u003e\n\n\n\u003c\/blockquote\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eFiller does not provide color, it provides durability\u003c\/h3\u003e\n\u003cp\u003eWhen leather ages, the color disappears first, followed by its structural integrity. The filler takes care of the second part — the one you only notice when you touch it.\u003c\/p\u003e\n\n\u003cp\u003ePigmented smooth leather has a thin, closed topcoat on the grain. Sun, friction, and skin oils attack this polymer over the years: it becomes brittle, loses its bond to the fibers underneath, and develops microscopic cracks. This becomes visible long before a real crack appears — as a matte, rough zone on the seat bolster, entry edge, or steering wheel rim that feels dull and slightly fibrous. If you run your finger over it, there is a slight drag.\u003c\/p\u003e\n\n\u003cp\u003eThis is exactly where the binder comes in. It is a water-based dispersion, meaning ultra-fine polymer particles suspended in water. After application, the water evaporates, and the particles flow together into a cohesive film — coating chemistry calls this film formation. Because this binder is formulated to be thin and penetrating, this happens not just on the surface, but in the broken gaps of the old topcoat. In other words: It acts like a glue that pulls back together from the inside what has drifted apart.\u003c\/p\u003e\n\n\u003cp\u003eTiming determines the effort. A surface that is merely brittle needs two to three thin layers and is then load-bearing again. The same surface a year later, with visible hairline cracks and frayed edges, additionally requires filler, intermediate sanding, and usually a complete recoloring from seam to seam. Taking the rough texture seriously early on saves you the elaborate process later.\u003c\/p\u003e\n\n\u003ch3\u003eThe neutral binder is the binding agent of this category\u003c\/h3\u003e\n\u003cp\u003eThere is one product in this category, and it intentionally has only one task: COLOURLOCK \"Binder\" (Neutral).\u003c\/p\u003e\n\n\u003cp\u003eNeutral here means without any pigment. The binder does not change the color of the surface; it does not lighten, darken, or shift the gloss level toward a greasy look. This is why it also works where you do not want to change the color at all: a dark leather sofa with a rough seat can be stabilized without having to search for a color match.\u003c\/p\u003e\n\n\u003cp\u003eIts typical areas of use are where clothing rubs constantly. In the car, these are the driver's seat bolster, entry edge, armrest, and steering wheel rim; in furniture, the front edge of the seat and the armrests; for bags, belts, and leather jackets, the crease and grip zones. In all these places, the topcoat is the first to become brittle, while the rest of the surface still looks flawless.\u003c\/p\u003e\n\n\u003cp\u003eTwo sizes cover realistic project needs. The 250 ml format is for a single bolster, a steering wheel, or a sofa edge — with enough left over for a second pass, which is almost always needed. The liter is the workshop size for complete seating sets that are stabilized over the entire surface before a spray gun is used. In our experience, DIY users are almost always right with the small container: the binder is applied thinly, and an opened bottle lasts a long time if stored frost-free.\u003c\/p\u003e\n\n\u003ch3\u003eFiller, body filler, and leather color solve three different types of damage\u003c\/h3\u003e\n\n\u003cp\u003eThree product groups that all sound like repairs work on three completely different problems. Confusing them means working on the wrong type of damage.\u003c\/p\u003e\n\n\u003cp\u003eFiller is for surface brittleness. No loss of material, no holes — the substance is still there, it just no longer holds together. This is the case where your fingernail doesn't catch anywhere, but the surface feels rough and crackles slightly when pressed.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"\/collections\/koch-chemie-colourlock-reparatur-leder-fuellstoffe\"\u003eLeather fillers\u003c\/a\u003e are for the opposite case: actual loss of material. COLOURLOCK \"Filler\" (Black) and COLOURLOCK \"Filler\" (White) provide elastic mass for craters, nicks, and worn-through areas and are sanded finely after drying. If your fingernail catches in a crack, you need filler — not a binder. For deeper, heat-curing repairs, \u003ca href=\"\/collections\/koch-chemie-colourlock-reparatur-spachtelmasse\"\u003eputty\u003c\/a\u003e is available.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-deckende-lederfarbe\"\u003eOpaque leather color\u003c\/a\u003e finally provides pigment. COLOURLOCK \"Leather Colour\" builds a new color layer in thin coats when nothing of the original tone is left. It does not repair anything, it covers — and it only covers permanently if the surface underneath is sound.\u003c\/p\u003e\n\n\u003cp\u003eThis leads to a simple \"if-then\" logic. If the surface is rough but intact, start with the filler. If material is missing, start with the body filler and then use the filler over the transitions if necessary. If both are fine and only the tone looks dull, skip the whole process and stick to the \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-farbauffrischer\"\u003ecolor refresher\u003c\/a\u003e. In our consulting, this is exactly the question we clarify most often: most customers overestimate their damage and underestimate the preparation.\u003c\/p\u003e\n\n\u003ch3\u003eDegrease, let dry thinly, sand in between, only then color\u003c\/h3\u003e\n\n\u003cp\u003eA binder only binds to what it reaches. Anything between the binder and the leather is a release layer — and release layers are the reason why leather repairs fail.\u003c\/p\u003e\n\n\u003cp\u003eThat is why the process starts with cleaning using a \u003ca href=\"\/collections\/koch-chemie-colourlock-reinigung-lederreiniger\"\u003eleather cleaner\u003c\/a\u003e and a soft brush, followed by the step almost everyone skips: degreasing with COLOURLOCK \"Degreaser\". It is only finished when a white cotton cloth no longer picks up any color. Anyone who uses brake cleaner, acetone, or denatured alcohol instead will remove the grease but also attack the tanning in the fiber — after that, no system from any manufacturer will hold in that spot.\u003c\/p\u003e\n\n\u003cp\u003eOn difficult, heavily silicone-contaminated, or very smooth surfaces, use a \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-grundierung\"\u003eprimer\u003c\/a\u003e before the filler: COLOURLOCK \"Leather Primer\" as an adhesion bridge, COLOURLOCK \"Blocker\" as a barrier layer if denim dye transfer is showing through. With intact, cleanly degreased smooth leather, you can skip this step — but it is better not to for older leather with a long history of care products.\u003c\/p\u003e\n\n\u003cp\u003eThen comes the binder, applied in several fine layers using a sponge, swab, or brush. Let it dry briefly between layers, sand lightly with a very fine leather sanding pad for deeper irregularities, and remove sanding dust with a microfiber cloth. The application temperature is about 18 to 24 degrees Celsius: below this, the polymer particles do not flow together cleanly; above this, the surface dries before the binder has penetrated.\u003c\/p\u003e\n\n\u003cp\u003eOnly then does the color application begin — depending on the case, with a color refresher or opaque leather color, finished with the \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-top-coat\"\u003etop coat\u003c\/a\u003e as a wear layer. Use the \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-additive\"\u003eadditives\u003c\/a\u003e to adjust the finish: the Crosslinker makes color and top coat more durable, the Duller lowers the gloss level, and Soft Slip and Wax Slip determine the feel. At the end is the part that no product can shorten: chemical cross-linking takes 24 to 48 hours, and for that long, neither jeans nor re-greasing care products belong on the surface.\u003c\/p\u003e\n\n\u003ch3\u003eWhere the filler ends and the upholsterer begins\u003c\/h3\u003e\n\n\u003cp\u003eA binder can hold a weakened structure together. It cannot replace a destroyed one — and that line is sharper than most expect.\u003c\/p\u003e\n\n\u003cp\u003eThe first limit is the type of leather. Aniline, nubuck, suede, and Alcantara are open-pored and have no topcoat that could be stabilized. A binder will saturate the fiber structure there, make the surface stiff, and take away exactly what you bought the leather for. A drop of water in an inconspicuous spot clarifies this in thirty seconds: if it soaks in and darkens the spot, the leather requires \u003ca href=\"\/collections\/koch-chemie-colourlock-pflege-anilinleder\"\u003eaniline leather care\u003c\/a\u003e, not a binder.\u003c\/p\u003e\n\n\u003cp\u003eThe second limit is actual loss of substance. If the fiber network beneath the grain is torn or punctured, no chemical can withstand the tensile forces that occur when sitting down — the repair will tear open again. The same applies to leather that has shrunk irreversibly due to decades of heat and feels like cardboard: the material will break next to the treated area upon the first flex. We prefer to say this beforehand rather than afterwards, because both cases will not improve with good intentions and three layers of binder.\u003c\/p\u003e\n\n\u003cp\u003eThe third limit is safety-relevant and non-negotiable. Seat bolsters with integrated side airbags have a predetermined breaking seam that must tear open precisely in the event of deployment. Any binder, filler, or top coat will stiffen the material there — none of those have any place on that seam. Such seams, detached covers, and saggy cushions are upholsterer work. Also be careful with perforated leather for seat ventilation: the binder will clog the fine pores if applied too heavily, and with the pores, the function disappears.\u003c\/p\u003e\n\n\u003cp\u003eAnd an honest assessment of expectations: this is workshop chemistry, not a weekend polish. The sequence of degreasing, priming, filling, coloring, top coating, and additives follows the data sheet, not intuition, and the order is not optional. If you don't want the effort, you are better served with a color refresher for light cases — or with a professional detailer who does the surface in one pass.\u003c\/p\u003e\n\n\u003ch3\u003eWhen the filler is your first step\u003c\/h3\u003e\n\n\u003cp\u003eTwo checks on the damaged area clarify the decision faster than any product description: run your fingernail over it once, and place a drop of water on it once.\u003c\/p\u003e\n\n\u003cp\u003eIf the drop beads up and the nail doesn't catch anywhere, while the surface still feels rough, dull, and fibrous — then COLOURLOCK \"Binder\" (Neutral) is exactly right, and that is before any color comes into play. If the drop soaks in, your leather is open-pored and this category is the wrong one. If the nail catches in a crack, start with the \u003ca href=\"\/collections\/koch-chemie-colourlock-reparatur-leder-fuellstoffe\"\u003ebody filler\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eIf the surface is stable again afterwards, the condition of the color determines the next step: only become dull, then the \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-farbauffrischer\"\u003ecolor refresher\u003c\/a\u003e is enough; visibly worn off, then the \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-deckende-lederfarbe\"\u003eopaque leather color\u003c\/a\u003e and the top coat over it. If you don't want to assemble the components individually, you can find matched combinations in the \u003ca href=\"\/collections\/koch-chemie-colourlock-sets-reparatursets\"\u003erepair kits\u003c\/a\u003e. One level up are all the brand's color stages: \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben-lederfarben\"\u003eBack to COLOURLOCK leather colors\u003c\/a\u003e, and you can find the complete range under \u003ca href=\"\/collections\/koch-chemie-colourlock-faerben\"\u003eDyeing \u0026amp; Finish\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThe idea that supports this category is unspectacular and yet makes all the difference: the filler is the only step in the dyeing process that you don't see in the result — and the first one whose absence you do see. Any leather dyeing job that tears open again after months is the bill for a surface that was never load-bearing. Two thin layers of binder on an afternoon decide whether the work above it lasts for years or for a single season.\u003c\/p\u003e\n","products":[{"product_id":"koch-chemie-colourlock-binder-neutral-neutrale-fuellfarbe","title":"COLOURLOCK \"Binder\" (Neutral) — neutral filler for brittle, cracked leather","description":"\u003ch2\u003eCOLOURLOCK Binder (Neutral) — neutral filler for structural leather repairs\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eWhat does COLOURLOCK Binder Neutral do? — The neutral binder stabilises damaged leather surfaces, fills fine cracks and worn spots, strengthens the structure and forms the load-bearing base before colour-specific products like Leather Fresh or Fluid Leather go on.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eCOLOURLOCK Binder (Neutral)\u003c\/strong\u003e is the professional base coat for structural leather repairs. The binder firms up the top pigment layer, fills micro-cracks, masks light fibre damage and preps the leather so coloured products grip better afterwards and cover evenly. As the neutral version it carries no pigment and works purely for stabilisation, not colour correction. Ideal for cars, furniture, fashion and all pigmented smooth leather showing wear, scratches or early cracking.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStabilises weakened leather surfaces\u003c\/strong\u003e – Firms up the pigment layer and stops small cracks from opening up further.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvens out micro-structures\u003c\/strong\u003e – Fills fine worn spots and gives you a smoother surface as a repair base.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeutral base for colour\u003c\/strong\u003e – No pigment, no tint – pure structural reinforcement before Leather Fresh or Fluid Leather.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eBinder technology \u0026amp; how it works in worn leather\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBinder Neutral\u003c\/strong\u003e uses flexible, high-grip binders that work into the damaged areas of the top coat and build a new, elastic structure right there. As leather turns microscopically brittle over time through friction and UV, the binder acts like a repairing „primer-filler“: it links loose pigment particles, closes small breaks and stops further fraying. Koch-Chemie says the layer stays elastic so the leather keeps its natural give. The neutral binder changes neither colour nor sheen — it just delivers the structural stability that makes the next colour coats grip far better.\u003c\/p\u003e\n\u003ch3\u003ePrep, application \u0026amp; the right repair sequence\u003c\/h3\u003e\n\u003cp\u003eBefore you use the \u003cstrong\u003eBinder\u003c\/strong\u003e, the leather should be cleaned and degreased thoroughly so the filler can work in evenly. You lay the binder down thin with a sponge, dauber or brush and build it up in several fine coats until the surface feels structurally sound again. Let it flash off briefly between coats so you don’t get uneven patches. On slightly deeper damage you can lightly sand in between to smooth things out. After the binder phase comes the colour build-up: Leather Fresh for light colour touch-ups or Fluid Leather for heavier repairs. Only on a stabilised surface will these products cover evenly and hold for the long run.\u003c\/p\u003e\n\u003ch3\u003eResults, typical uses \u0026amp; how it differs from coloured products\u003c\/h3\u003e\n\u003cp\u003eAfter application the area feels smoother, sturdier and far better prepped for a colour refresh. \u003cstrong\u003eBinder Neutral\u003c\/strong\u003e earns its place wherever there’s structural damage: seat bolsters, steering wheels, furniture edges, the high-wear zones of bags and jackets. It doesn’t replace a full colour repair — the coloured versions of the Binder range or Leather Fresh are ideal for that. Neutral is deliberately the „invisible“ base that dials in structure, firmness and grip. In the car interior especially it lays the groundwork so later repairs don’t flake or look blotchy.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCommon questions about COLOURLOCK Binder (Neutral)\u003c\/h2\u003e\n\u003ch4\u003eDoes the binder colour the leather?\u003c\/h4\u003e\n\u003cp\u003eNo. The neutral version carries no pigment at all and works only for structural stabilisation.\u003c\/p\u003e\n\u003ch4\u003eIs binder the same as leather paint?\u003c\/h4\u003e\n\u003cp\u003eNo. Binder is a filler and firming product. For colour touch-ups you use Leather Fresh or Fluid Leather.\u003c\/p\u003e\n\u003ch4\u003eHow many coats do you need?\u003c\/h4\u003e\n\u003cp\u003eOne to several thin coats depending on the damage. The key: always work sparingly and let it dry well.\u003c\/p\u003e\n\u003ch4\u003eCan I use binder without primer?\u003c\/h4\u003e\n\u003cp\u003eWith good grip conditions, yes. On tricky or silicone-heavy surfaces, Leather Primer beforehand is the way to go.\u003c\/p\u003e\n\u003ch4\u003eDoes binder make the repair last longer?\u003c\/h4\u003e\n\u003cp\u003eYes. Stabilised areas hold colour better and are less prone to cracking open again.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003csmall\u003eLast updated: 02.12.2025 — Author: Daniel (Detailing1)\u003c\/small\u003e\u003c\/p\u003e","brand":"Koch-Chemie × COLOURLOCK","offers":[{"title":"Neutral \/ 1000 ml \/ 1 liter","offer_id":56320202899791,"sku":"D1-KCX-481-1L-01","price":49.99,"currency_code":"EUR","in_stock":true},{"title":"Neutral \/ 250ml","offer_id":56320202932559,"sku":"D1-KCX-481-250ML-01","price":18.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/3272\/7375\/files\/481-1L-01_1.png?v=1762116834"}],"url":"https:\/\/detailing1.eu\/collections\/koch-chemie-colourlock-faerben-fuellfarbe.oembed","provider":"Detailing1","version":"1.0","type":"link"}