Sand: your toaster oven experiment, will forever be deeply engraved in the annals of scientific testing, however I didn't get the impression from your post that the oven or the paint caught fire. lol
I thought it merely blistered the paint, hence if you move the heat source and the paint in distinctly inverse directions at some point your paint won't blister. lol
Sand
Try the car roof, now that they have a flame proof paint you can really make a neat nanomobile. One which is water proof, insulated and flame proof and if it comes in colors and an enamel finish you are really home free. Wow the US Army should love that stuff, but independent industry accepted testing and competitive costing is required usually.