I'm not too fond of the Acraglas package myself. The release agent is way too thick IMO no matter how you apply it and the bedding compound itself contains nylon which is hygroscopic (attracts water) -- pretty much the last thing you want in the rifle action-stock interface. Sure it might be that the nylon among the epoxy never gets in contact with water but why take the chance when there's plenty of epoxies to choose from and the cost per rifle is insignificant?
The bedding fit should remain constant or the bedding job is suspect. After all the idea is a casting that accurately and repeatedly hugs the entire action surface without introducing distortion.
I'm not a benchrest fan -- I endorse all shooting sports but my personal preferences just lie elsewhere -- but the guys have it nailed with the mantra "bullets, barrels, bedding".
My bedding jobs are far from perfect presentation-wise (I'm getting better and getting more new and proper tools don't hurt either) but I consider the castings to be accurate when I get all the wrinkles from the action and I'm even able to read "Made In Finland" as a reverse shadow in the bedding -- and that's with the lettering packed with clay