20 whatever years ago I used Acraglass and their blue release agent and worried a lot. Now I use WD-40 and JB Weld. Have used the regular, Kwik Weld and the white putty. All worked. Don’t give up, I had to do a few redos because I missed a spot, didn’t put enough epoxy in and/or rushed it. Prep is everything. I had a couple come out looking crappy but the rifles still shot great. 
