I blasted my 331 hemi valve covers yesterday to get them ready for prime and paint. Its gonna be some time before the engine is complete and I dont want rust to reform on the inside of them again. I know regular paint is a bad idea. Would glyptal be ok? Or maybe just a light coat of rust converting primer since its high in zinc? I live in NC and....well if its not protected, it will rust. Rust is as bad as termites around here. Suggestions?