I’ve made nearly 50 ukuleles but I still sometimes struggle with the finish on some kinds of wood. Woods like Milo, and Koa are of particular concern. I seal the wood wit 3 or more coats of UV resin, then spray between 10 and 15 coats of instrument lacquer on, sanding lightly between coats. After about a week of drying and hardening, I wet sand from 400 grit to 2500 grit. The I buff it to a brilliant shine. Okay, the problem arises several weeks after buffing. The finish seems to develop tiny bumps on most of the surfaces. It never seems to happen on the neck which is made of African Mahogany. I’m thinking is could be some of the oils or resins in the wood that are working their way to the surface through all of the layers of finish. Any thoughts or suggestions anyone?