Hello AeroAggie,
I‘m late in my reply but have to give you a shout out for this(your) post that solved a build I was stuck on. In 2018 I had my Hangar 11 4” X-15 dry fit and ready for assembly, I was high centered on attaching the side skins. They completely cover the 36” body tube and make contact everywhere except the wing bulges. I had three conditions to solve, compatibility ABS to cardboard, fairly large amount of surface to cover and a extended working time to mix, apply, fit and clamp.
Lucky me I stumbled on you post just at the right time with some of the most beautiful filets I’d ever seen!! Also, a very detailed post about your Loctite120 application, now other than tacking I use almost exclusively, Thank You!