I am working on a car that the frame is scaley but intact. No holes just like big flakes of metal can be peeled off of it. A friend said there is some kinda stuff out there that I could paint on and it would make the frame harder than original and get it ready for paint. Somehow stopping the rust in it's tracks. Then being a good base coat to apply primer to then paint. He said he did not know what it was called but saw some a long time ago. Is this true? Does anyone know of something out there like that?