Interesting… yeah it’s built fine with correct materials and the glue joints look solid… never seen anything like that.. that’s the last place I’d expect to see crazing..48" x 24" x 24" 120g made with 1/2" acrylic
Made by a very respected acrylic tank builder whose been in the business for years. I can't say for certain, but very much doubt he flame polished.
The only place it crazed was along edges where the mat was freshly cut. (It was on 3 edges, my memory is cr**.) The back edge of the mat was a factory cut edge, and no crazing took place along it. I assume it had plenty of time to finish out gassing while sitting in the factory/warehouse.
I don't want derail the OP's thread any more than I already have.
Like I said, just sharing my experience.
And on my current tank, the upgrade I'm doing this fall, and any future tanks (they'll all be acrylic, after trying it, I doubt I'll ever go back to glass) I won't be using a mat. Just my decision/plan.