Theres no need to remove old paint off a cement floor before painting with epoxy paints. This makes painting the floor considerably less troublesome and safer than painting bare cement. Instead of using acid to etch the surface, youll only have to sand lightly. Phosphoric acid, Rustoleum and learning the hard way. Unlike Rustoleum, Ospho isnt as famous. Spray primer and then Rustoleum. It is an effective yet affordable solution that cleans out dirt and corrosion. Reading the Ospho directions it says "Test trial samples before using epoxy or other paint systems." I want to I've used etching primer and rattle can enamel over it with good results on frame/suspension pieces but haven't myself used automotive grade paint over it. wipe it down to remove the loosend rust, then spray it To neutralize the Ospho MUST be wet, so if dry, re-wet with itself and let set one or two minutes and with a clean rag and water, wipe off like washing the car and then dry. It always seems soft and easily scratched or removed. Contact Us - That is why most people consider painting it over Osphos dull finish. Agree with above, I've had good luck with ospho (and naval jelly). I was dry to touch but not to the primer. //-->. I do plan to hit t(e whole car with the sander before spraying. Can you paint over iron phosphate? Therefore, using it over a paint such as Rustoleum may not stick for long. I understand your concern. You want the 24 hours for the reaction to be complete is my understanding. Its advisable not to rush this project. Ospho dries overnight. Phosphoric acid (like concrete etcher) wont affect the paint. Unlike You will find that we have the finest range of products. Merely remove loose paint and rust scale, dirt, oil, grease, and other accumulation with a wire brush or pressure washer and let dry- apply a thin coat of OSPHO as it comes pre-diluted in the container. I figured any rust missed by the sandblasting was converted by the ospho. Saved many inboard/outboard boat parts using this stuff. WebA: No. Login with username, password and session length, A man armed with common sense is packing a big piece, the foundation for a successful life is being able to recognize what to least expect the most (anonymous). //-->,