I am a professional marine painter/blaster/powdercoat guy. It's how I make my living. And no I can't do anything at work even for myself!
Sandblasting is the BEST way to prep most any metal for paint; even sheet metal if you use the right media and turn down the pressure.
I haven't yet learned about this POR-15 product but as concerns toxicity; anything you apply to protect your metal is most likely toxic. Most respirators are for ORGANIC (at one time it was alive)materials, inorganic products will go through organic filter media in your respirator; so always ask for the "product Data Sheet" and the MSDS for stuff your going to use. You can learns tons of stuff from them.
I can tell you powdercoating is very tough but chips like paint because it's so hard! It can sanded and it can be touched up with paint as well.
For show vehicles I would powdercoat, for daily drivers I would consider paint as it's easier to repair as it sands easier and the right kind of paint might be a little more mallable and not chip so much.

Last edited by Doug9656; 10/13/2009 12:43 AM.

1999 GMC Yukon
1957 GMC 100 Panel