I have already installed it and it workes good. They sell it in rolls for like $12 something a roll where I live. You could just do more layers with the extra...
You can get Peel & Seal from Home Depot. Some have it, some don't. Look in the roofing section for other material that is asphalt based, aluminum backed, and has an adhesive side.
Second Skin, eDead, Brown Bread, etc all work as well. I think ANT (Second Skin) is based out of AZ, so he might be close to you ...
I live in Yuma, Az and we regularly hit 120 F during the summer. Will Peel and Seal work here? I would like to se if anyone has put it to these extremes yt cause i know that the trunk is going to go above te 150 f temp that the company recomends. Also Ant could you hit me up with some prices for SS??