I realize some people have used Por-15 and now I read about the Master Series stuff. I've wire brushed most of the rear of my car and got the flaky chunky pieces removed as well as some of the surface rust. I now have a mixture of some old original dull paint, places with bare metal, seam sealer, and some reddish stuff that Im pretty sure was old primer. Can I apply either of those "paints" over all these places or do I need to get a better consistency? I will be using some of the prep chemicals as is mentioned on the Por website and make sure all the dust is up. Input please.........almost forgot, how strong does this stuff bond? some areas are also thin from rust. Will either actually strenghten the metal so I dont need to worry about rust through?