Sikkens paint has been used in refinishing cars and trucks for over 100 years and is widely considered an excellent-quality paint for refinishing purposes. Like other paints, however, it may become necessary to apply paint over the top of the Sikkens finish. While this would be a problem if the Sikkens paint were still wet, in actuality you could paint over Sikkens once it is dried with any other paint system of your choosing. All that is required is proper surface preparation.
Clean the vehicle's surface with soap, water and a clean sponge. This should be the first step in any automotive paint job. It removes excess dirt and dust that will contaminate the paint, and gives the painter the opportunity to locate any scratches or chips that must be repaired prior to application of the base coat.
Moisten a rag with wax and grease remover, while keeping another rag dry. Wipe the surface of the vehicle with the moist rag, immediately wiping the wet streak of wax and grease remover with the dry rag.
Scuff the painted surface of the vehicle with the grey automotive scuff pad. This is intended to remove the gloss from the vehicle's finish. Glossy paint does not allow a second base coat to properly adhere to it. Over time, the coat of paint applied over the Sikkens would peel off. When complete, wipe the surface again with wax and greaser remover.
Apply a light tack coat of paint over the vehicle after it has been prepared. This will provide even greater adhesion to the thicker coats. Allow the tack coat to dry for approximately two to three minutes, and then apply the second, heavier coat of paint over the vehicle. Paint from the top middle of the car's roof to the bonnet and boot, and then finally the sides of the vehicle. The first coat should be medium-heavy or just thick enough to hide the paint beneath it but not so heavy that it runs or sags.
Apply the clear top coat to the second base coat after it has been allowed to dry for 15 minutes. Apply three medium-heavy coats of clear to the surface to completely encapsulate the car's finish. Allow the finish to dry completely before touching the vehicle.
Keeping the vehicle perfectly clean is absolutely critical in ensuring a quality paint job, regardless of what kind of paint is used. Paint curing times will vary according to the paint system manufacturer's specifications. If you are painting in the open air, allow 24 hours of drying time before touching the finish.