There's a huge difference between covering a built-up structure and a sheeted structure. My Stik 30 has Oracover (Ultracote) on it and it bubbles horribly in the sun. As far as I'm concerned they should all be called Crapcote. By the way, the plane was finish sanded with 600 paper and then vacuumed with an industrial shop vac. Doesn't matter what you do, same problems.

I'm back to painted finishes unless I want to do a transparent scheme. Then one iron-on is the same as another.

So....

Gems
Silk and Dope
Tissue and Dope
Silkspan and Dope
Fiberglass and (resin/poly urethane, et al)

Junk
Any iron-on plastic