Thank you, this is useful information! I'm new to building with foam so I'm trying to learn as much before starting the assembly.Some people have said that they've had trouble hot gluing to minwax treated FB. I haven't had that problem, it's worked fine for me. I almost always build the plane and then apply the minwax - apply with a brush, watch it penetrate the paper and then wipe off the excess with paper towels. I do the FT method of making hinges so don't do tape hinges but where I use tape for reinforcement or trim I haven't had any problem with it coming loose.
I have had one unusual problem. I minwaxed a plane and then didn't get back to it for a couple of months. When I put filler on to smooth some seams it immediately delaminated the paper. I applied another coat of minwax, waited a day and used filler again with no problem. Go figure.
I figure it's easier to Minwax the flat board then assemble vs dealing with multiple angles of a built plane. Why do you build first then apply if the Minwax doesn't affect the hot glue? Is it just preference?
Do you tape after you've painted or before? I figure the tape will prevent paint from sticking.