I've always used shoe goo to mount donuts. Prep the rim to remove as much of the old rubber as you can, scuff it up, smear shoe goo on the rim and inside the donut, slide together, square up the edges and make sure the donut is over the entire width, wipe away the excess shoe goo, let it sit overnight and true as normal.
It can be a little on the messy side, but I've run tires all the way to the rim, no failures with Paragon GFX, and if you reuse the wheel again, it's a bit easier to clean the wheel for a new donut, just takes some peeling and dedication.
Plus [for me], using shoe goo doesn't subject the wheel to acetone or thinner that might soften and distort the wheel [if you don't have a damaged wheel to test with before hand].
Just like a lot of things in RC, everybody has different methods for things, and most of them work.