There are five that I have used that are still available (when in stock).
Ultracote makes 2 versions; one is Parklite, the other is Ultracote Lite. They feel and weigh about the same. Parklite is opaque colors, while Ultracote Lite are transparents. Unfortunately, I have been watching their stock levels lately as I would like to use some on an upcoming project and many of the colors seem to be perpetually on backorder :-(.
I used Parklite to cover my Stevensaero 4charlie.
My Diana glider has Ultracote Lite for the transparent purple. The fuse was covered with another option, DocuLam. Doculam works very much like the Parklite/ Ultracote Lite. I scuffed it and sprayed it with Rustoleum 2X spray paint after and it seems to hold up ok.
Tench mentioned Aero-Lite from Stevensaero. I used it on their Ring-Rat and S-Pou kits. It feels very similar to the Parklite/Ultracote Lite and works quite well.
WillyNillies sells what they call Willykote. It is a lighter-weight version of the Chinakote that is available from Hobbyking and Value Hobby. It works well, but I found it to shrink with more force so you have to be careful not to warp your airframe. Now I was working on a 28" span model versus your larger Eindecker, so you may not have the same issue. It isn't quite as lightweight as the other options, but would still be fine for a 36" model.