Click on the camera under my name and look at my truck,it has rustoleum rusty metal primer in the quart can and red oxide ratlle can applied very thick and its held up for over a year.I have sanded a couple of spots over the last year to look for rust underneath and so far there has been none,only where I applied it thin on the edges......so I just sanded the rust off and applied more in that area.Actually its been more like almost 2 years