Koch-Chemie WetGloss "Wg" Wet Coat Sealant for Extra Gloss and Strong Hydrophobicity 500ml

Paint sealing in minutes instead of hours of polishing with the Koch-Chemie WetGloss

What is the Koch-Chemie WetGloss? A ready-to-use wet coat sealant on a polysiloxane base that you spray straight onto wet paint after the wash and rinse off with the pressure washer. Three to six weeks of measurable beading per application, no buffing. Not suitable for matte paint, matte wraps, fabric soft tops or fresh paintwork under 30 days old.

Koch-Chemie WetGloss is a ready-to-use wet coat sealant from Koch-Chemie in Unna that goes on right after the wash with no polishing or wiping step. The active ingredient is an amino-functional polysiloxane — in plain terms, a flexible silicone polymer with two different ends. One end carries nitrogen anchors (amino groups), the other water-repellent methyl groups. On wet paint the polymer lines itself up on its own: anchors into the clear coat, methyl ends facing out. What that means for you: the water beads straight off in tight little balls instead of clinging to the paint — no carnauba wax, no silicon dioxide like a ceramic coating, just a self-aligner that holds for three to six weeks.

Detailers call this workflow "spray-on, rinse-off": spray it on, rinse it off, done. You lay the WetGloss down section by section on the wet car right after rinsing off the shampoo, the pressure washer spreads the polymer evenly across the section in seconds, and the excess runs off with the rinse water. Drying with the microfibre towel is the only moment you still touch the paint. Handy: it works as a standalone sealing step between full details — and as a topper over existing ceramic or wax coatings, freshening the hydrophobics so you can hear it and visibly tightening up the way water beads off.

• Beading refresh in minutes. Straight after the rinse, water beads off the paint in tight, compact drops instead of forming a flat film — that classic showroom-fresh effect. Day-to-day you'll see it from the first drive in the rain, and the next time you dry the car you'll go through half the microfibre. It saves you the wipe-and-flip dance of a dry spray sealant and the slog of buffing off a carnauba wax.
• Three to six weeks of protection per application. On the typical commuter routine with a wash every two to four weeks, the polymer layer runs right through to the next refresh. The 500 ml spray bottle covers three to five mid-size cars when you work section by section — about 2.30 to 5.10 euros per seal. The 5-litre canister pays off from the second car in the household or in commercial use.
• Ready to use, no diluting, no foam lance. Unlike the Hydro Foam Sealant S0.03, which gets diluted 1:50 to 1:150 through a foam lance, or the Spray Sealant S0.02, which needs 20 minutes of buffing once it's flashed off, the WetGloss only asks for a spray bottle, a pressure washer and a microfibre towel. What that means for you: the whole sealing step fits into a single bay slot at the self-service wash.

Day-to-day from Detailing1: The costliest mistake with the WetGloss is letting it flash off on paint that's too warm. Once a panel hits roughly 30 to 40 degrees — which dark paint reaches within minutes in May sunshine — the alcohol carrier solvent (2-propanol, technically) evaporates so fast that the polymer cross-links unevenly. In plain terms: the amino-functional polysiloxane only grabs the paint in patches and leaves white streaks or water spots in the bits it didn't cover. Worst case you have to pull the residue off with an alkaline cleaner or even a light machine polish — half an hour of extra work the application was meant to save you. So always work in the shade, on a cool body under 25 degrees and section by section: spray the bonnet, rinse it straight away, then move to the next section. The pressure washer is a must. Its hard jet drops the consumption from the 250 millilitres the maker quotes defensively to a realistic 100 to 150 millilitres per mid-size car.

Applying WetGloss properly: wet paint, section, high pressure

You spray the Koch-Chemie WetGloss section by section onto the wet car right after the wash, rinse straight away with high pressure and dry with the microfibre towel. Three steps, no buffing.

The running order in practice: car pre-washed, foam rinsed off, body still dripping wet. You grab the spray bottle, give it a quick shake and work in sections — half the roof, one wing, one door area. Six to eight pumps per section is plenty, no flooding it. Straight after, rinse off with the pressure washer from about 30 centimetres, top to bottom, until the water rolls off in tight drops and no foam streaks run down any more. Only then move to the next section.

The rinse pressure makes or breaks the result. A plain garden hose won't cut it: the polymer won't spread evenly and you'll burn through twice as much for half the result. You want over 100 bar, the kind every self-service wash box delivers. With hard tap water, dry straight after the final rinse — leftover water otherwise leaves limescale spots on the freshly sealed surface.

For drying, a soft microfibre drying towel pulled across in sections does the job. In day-to-day Detailing1 work it runs best out of the Koch-Chemie range in the order wash, wheel cleaning, WetGloss, dry — the whole exterior workflow on a mid-size car comes in under 25 minutes.

Aminosilane fixes no paint defects and masks your coating temporarily

The WetGloss is not a substitute for a paint correction and not a multi-year protection layer — it tops up your routine between full details with beading you can measure right away. If you want to take out scratches or buff away holograms, you're in the wrong place.

The clear no-go substrates. Matte paint and matte wraps get optically smoothed over by the polymer, leaving an unwanted greasy look — the maker rules this use out explicitly, and the only way back out of that effect is an alkaline cleaner. Fabric soft tops soak the emulsion up unevenly and stiffen the fibres; there are dedicated textile sealants for those. Fresh paintwork under 30 days old needs time to off-gas — a seal on top can slow the curing and, worst case, lead to clouding. Bare polished aluminium can streak depending on the alloy, because the raw metal binds the polymer's nitrogen anchors differently than a closed clear coat.

The second, less well-known behaviour is the masking effect: lay WetGloss over an existing ceramic coating with pronounced sheeting behaviour — that is, water rolling off flat rather than forming drops — and for three to six weeks the polymer takes over the water behaviour of the seal. Your SiO₂ coating's flat sheeting turns into beading. In practice: the coating isn't harmed, and once the sacrificial layer washes off the original behaviour comes back. But if you've only just had a premium coating built up, be aware of the temporary change in character and use it more as a winter refresh.

The choice logic within the Koch-Chemie range. If you want a touch-free refresh in minutes between washes → WetGloss. If you want maximum durability on dry paint and you'll take the manual buffing → Spray Sealant S0.02. If you want a pro wax seal through the foam lance with a carnauba character → Protector Wax Pw. If you want a snow foam concentrate with foam-lance dilution 1:50 to 1:150 for the workshop → the Hydro Foam Sealant S0.03 is the better tool.

For maintenance-interval detailers, not for the full reconditioning job

The WetGloss is the right call for anyone who washes their paint every two to four weeks and wants to build up visible protection between sessions. After the regular hand wash you reach for the spray bottle, six pumps per section, rinse, dry — five minutes of extra work for four to six weeks of measurable hydrophobicity.

It's especially economical in a multi-car household and in small commercial use. At a realistic consumption of 100 to 150 millilitres, the 5-litre container covers more than 33 seals. Run the WetGloss alongside a regular foam pre-wash and you stretch the effective durability even further, because the polymer doesn't have to break down any heavy crust and can build cleanly onto a well-kept surface.

The WetGloss is less suited to reconditioners with a snow foam lance who have to run bigger fleets touch-free — there the concentrated Hydro Foam Sealant S0.03 wins on cost per application. And for paint-shop handovers with fresh repair paintwork, the 30-day waiting window applies, no exceptions.

The one trick the maker doesn't say out loud: don't spray the whole car at once. Lay one section down, pull the water film over it straight away with high pressure, then on to the next. In plain terms: the polymer only needs the seconds in which the hard jet pushes the material across the wet panel — that's exactly where the cross-linking happens, before the alcohol carrier solvent evaporates and can leave streaks. What that means for you: two applications per 500 ml bottle become four to five, the real per-litre cost halves, and you still get measurably tighter beading than spraying the whole car in one go.

Store frost-free between 5 and 30 degrees, shake before use. On the compliance side: because of the classification "harmful to aquatic life" (H412 under GHS), only work with it on a wash bay with an oil separator. A private driveway with a direct connection to the rainwater drain is off-limits under environmental law in the DACH region — so the trip to the self-service wash box or the commercial detailing park isn't just convenience, it's a must.

Application of Koch-Chemie WetGloss

Apply in sections, high pressure disperses

WetGloss works as a spray-on, rinse-off sealant immediately after washing. Step one: Wash the car regularly with pH-neutral shampoo, then rinse off the foam completely. The body remains dripping wet. Shake the spray bottle briefly, open the spray nozzle.

Step two: Work section by section, do not spray the entire car at once. One section (half a roof, one fender, one door area) receives six to eight evenly distributed sprays from a distance of approximately 25 centimeters. Immediately afterwards, rinse with a high-pressure cleaner from a distance of 30 centimeters from top to bottom until the water runs off in dense drops. Over 100 bar, as available at any self-service car wash, is ideal.

Step three: Dry with a microfiber drying towel in sections, do not rub. If the tap water quality is hard, wipe off immediately after the last rinse, otherwise you risk limescale stains on the freshly sealed layer.

Notes: WetGloss is not suitable for matte paints, matte films, convertible fabric tops, freshly painted surfaces under 30 days old, or uncoated polished aluminum. Avoid application in direct sunlight and on hot paint; at component temperatures of approximately 30 to 40 degrees Celsius, the product dries too quickly and leaves white streaks. Due to the classification H412, use only at car wash facilities with oil separators — a private driveway with a direct connection to the storm sewer is legally prohibited in DACH (Germany, Austria, Switzerland). Store frost-free between 5 and 30 degrees Celsius; lasts 24 months after opening.