Gasoline would melt it... But the clean up really sucks...
Yes, it's the same foam. We used 3M Super77 spray adhesive to glue it together. Don't use Super90 as it well melt the foam on contact (77 will melt the foam if you spray too much).
We didn't buy from home depot though... HD sells 3/4" boards - we are using 1". The foam works well for car fairing type projects
