I worked at a place where we had over a dozen different industrial epoxies, mostly in 55gal drums. We used the exact epoxy that JB Weld is marketed to for consumers (there are only a small handful of epoxy mfg's world-wide). I found it was far more "brittle" than other epoxies, and when heated seemed break its bond more quickly. It was primarily used to be mixed with fine silica to use as a trowel-on for industrial-chemical settings to cover and protect concrete from erosion. I call it "weak" (a simplistic term obviously) because it is more brittle and its bond breaks quickly when heated, which makes it ideal for bases/screws. Personally, I wouldn't use it for bedding due to to its brittle nature, but obviously it works fine. IMO Devcon Marinetex and Acraglass Gel are better epoxies for bedding.
Just one man's opinion based on industrial use...
