Before Acraglas Gel, I used regular Acraglas, but mixed a lot of chopped up fiberglass insulation in it to stop it from running so much. It also seemed to make it stronger and reduced shrinkage. The liquid Acraglas seems to penetrate into wood stocks better than anything else I've used.
I make my own pillars from 1/2" steel tubing, lightly grooving the outsidesfor better locking into the stock.
Clear paste shoe polish works well for a release compound, wiping it off after drying. Two coats and wiping insures good coverage.
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