I wouldn't waste my time on Acraglass. OK, but I've found the MarineTex from boating supply stores to be much better. Better shear and shock resistance. Cheaper, and comes in grey and white. Grey looks like black-parked steel. easier to finish, and fully machinable, if needed. Lasts longer than Acraglass, NEVER crystalizes, and comes in several forms (I prefer the tubes). LOTS easier to work with (paste rather than semi-liquid). Water-based release agents work perfectly.
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