Yeah, one of the main considerations for Line-X products is actually the installer. There seems to be a HUGE amount of variance in the quality of the product depending on the installer (application). There are different methods at different costs, but as with most things, experience with the product is the the biggest factor.
I just disassembled the belly pan of a 1976 Excella 500, and there were places where the aluminum had literally disappeared into nothing. There are very few places where the aluminum could be reused (even for scraps to patch things). It's a testament to the fact the aluminum isn't the most durable substance, and not so well suited for the underside of our Airstreams. That said, you can't beat the weight! [smile]
Thus, it would be fantastic to find a material that would work well to protect the aluminum panels on the underside of Airstreams. This is especially important as I continue to design with "improved boondocking" in mind. Judging by the photo of the front panel on your AS, it looks like you are definitely in the "extreme boondocking" category, which is my ultimate goal for these builds.
Thanks for posting, and keep us updated as to how it holds up!
25' 1972 Airstream Trade Wind Land Yacht (heavily customized)
2006 Jeep Liberty CRD (diesel)