LOL!! Once again, Susan, you crack me up and made my day. I didn't even know we could type in large screaming red letters. How did you do that, BTW? I don't see any font options on my reply page. Bless you for this and all your other wonderful posts.

MacTech (aka "Blast, Jr.") - Two quick thoughts: one, how about some powdered magnesium? Two, fires on asphalt will, at the least, soften and/or bubble the pavement. With persistent high heat, you can even start it on fire. And I think that Susan will agree with me that you're just the guy to do it. So think concrete, or at least concrete block. And thank you for your research.