I use alumilite epoxy, I mix slowly (for 5-6 minutes), I let the epoxy sit for 5 minutes once mixed to allow bubbles to rise. When I apply the epoxy to my tumbler there are no bubbles in the medicine cup. I used a butane torch to pop whatever bubbles I may not see once the cup is spinning. After 24 hours I still find bumps/ points in the epoxy. I sand it down, wash it with dawn and let it air dry before I do another coat, but it happens every time, and I don’t not know what to do. Any ideas?