Can it be applied on a wet surface ? November 23, 2020 10:26 No, only on well prepared, decontaminated and degreased with Q²M Prep surfaces or on top of another ceramic coating. Related articles Can I apply multiple layers? What surface can you apply Q² Wax on? Can I use it as a top coat to another coating? Will it prevent water marks or bird droppings damaging paint ? How to maintain a vehicle coated with that product ?