To prep the metal parts before coating with the release agent, I clean with rubbing alcohol to degrease, and rinse with distilled water. This promotes good adhesion by tape for those areas you want to keep epoxy away from, like the sides of the recoil lug (if it is square/not tapered) and to the bottom of the lug to prevent it from bottoming out in the pocket. It is also a good idea to tape off the action above the stock line ... taping off the stock areas where the epoxy will ooze out will also so save a lot of work and keep the job neat.
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