Use Kiwi neutral shoe polish for release agent . You can usually find this in grocery stores etc. Apply with a cotton patch and buff with another patch in 5 minutes.
I have fitted recoil pads using acraglass to bed the pad screws . Sand both pad and stock surfaces as required. Open up screw holes I used 10-32 allen bolts with a few nuts (last one with a plastic lock) bedded to the stock .For restricted areas use a threaded bushing . Set this up by applying release agent to all parts except the outside of the nuts. Then assemble all the parts and bed the pad using surgical tubing to hold everything in place while the glass sets up. Coat tubing this with release agent first also . Good luck .