Originally Posted by costina

I work in the restoration game and our painters use epoxy primer on bare steel. It states on the epoxy we use you can leave the part outside for upto 3 months with no effect. And believe me is sticks like shit to a blanket and is really difficult to sand off.

I find etch is good for small areas, repairs etc.

All depends on what you want really. remember Gravitex is porous and will require painting after.