It easily and quickly removes all rust and yellowing marks on the gelcoat without emitting vapors and restores the original color of the gelcoat. It is in gel form, so it cannot be spread on the antifouling paint. It stays on the surface, achieving optimal results within 15 minutes. 

Instructions for use: Apply with a roller or sponge on the gelcoat. Let it work for 10 to 15 minutes. No mechanical action is necessary. Rinse with pressurized water.