Koch Chemie Hydro Foam Sealant S0.03 is a sealant concentrate that you apply to the still-wet car after washing, with a foam gun or a pump sprayer. You dilute it 1:50 to 1:150 with water, leave it for a short time and rinse it off thoroughly. Paint, glass, plastic and convertible roofs get a hydrophobic protective layer in one go, with no separate application step on dry paint.
Below you will find how to mix the concentrate, which dilution suits your method and where things usually go wrong with a wet sealant foam. The product smells of cherries, a pleasant extra while you work.
Koch Chemie Hydro Foam Sealant S0.03: the key facts
Property | Detail |
|---|---|
Content | 1 L |
Type | Spray sealant (concentrate) |
Dilution | 1:50 to 1:150 with water |
Suitable for | Paint, glass, plastic and convertible roofs |
Application | Foam gun or pump sprayer, on a wet vehicle |
Scent | Cherry |
Keeping the mixed solution | No, single use |
Which dilution should you choose?
The range of 1:50 to 1:150 is wide, so you adjust it yourself. A stronger mix (towards 1:50) puts more product on the car, a weaker one (towards 1:150) keeps consumption low if you wash often. One litre of concentrate therefore makes up to 150 litres of ready-to-use solution. The table below is our own worked example (1,000 ml divided by the ratio), not a figure from Koch Chemie:
Dilution | Worked example: concentrate per litre of water | Suits |
|---|---|---|
1:50 | about 20 ml | More product on the paint |
1:100 | about 10 ml | Our advice as a starting point |
1:150 | about 7 ml | Economical, for frequent washing |
How to do it
Wash the car clean first. Hydro Foam Sealant goes onto a cleaned vehicle, so start with a normal wash and leave the paint wet. Tip: work in the shade, so nothing dries in before you are finished.
Mix the solution. Dilute the concentrate 1:50 to 1:150 with water in your foam gun or pump sprayer, and mix only what you need now. Tip: start at 1:100 (our advice, the manufacturer gives no starting value) and adjust next time. How ratios work is explained in Dilution explained.
Apply the foam. Foam or spray the solution evenly over the wet car, panel by panel, including the windows and the convertible roof if you have one. A foam gun dilutes the mix further itself, so adjust the pre-dilution in the bottle to match. You can read how to set up such a gun in Connecting and adjusting a foam lance.
Let it dwell briefly. The manufacturer gives no fixed time, only short. Tip: make sure the foam does not dry, and work in sections in warm weather.
Rinse thoroughly. Rinse every trace off the paint, glass and plastic, otherwise spots stay behind. Tip: rinse from the top down and do not skip a corner.
Dry the car. Remove the remaining water before you put the car away, so no water spots are left. How to do that without scratches is covered in Drying your car without scratches.
Common mistakes and tips
Not rinsing well. Residue on the paint or windows causes spots, so rinse generously.
Mixing too much. You use the solution straight away and do not keep it for the next wash.
Working on dry paint. The product is meant for a clean vehicle that is still wet.
Forgetting to adjust for the foam gun. A gun dilutes the mix too, so match your pre-dilution to it.
Working in the sun. On a warm panel the foam dries too fast, so work in the shade.
Skipping the windows. According to the manufacturer, rain water runs off them quickly, which helps visibility.
What to combine Hydro Foam Sealant with
Koch Chemie Finisher Magic Shampoo is pH-neutral and safe on wax, sealant and ceramic coating. That makes it a logical base for the wash before the sealant.
If you want to pre-wash first, How to use snow foam explains how.
Liquid Elements Black Hole Drying Towel is an edgeless 40 x 40 cm microfibre towel with high absorbency for the last step.
Koch Chemie Finisher HydroBoost Wet Sealant is a second wet sealant, which you apply spray-and-rinse while washing.
Chemical Guys Foam Gun Adapter connects your foam gun to a standard garden hose without leaks.
You will find more options in the sealants and quick detailers category and among the foam cannons and guns. If you are torn between products, read Best car sealant or Choosing wax, sealant or ceramic coating.