I bought a couple of these doors: http://www.homedepot.com/p/Masonite-...7315/100075801 which I'm finishing with Waterlox Marine. The borg's website says they have tempered glass, but I can't tell by the "tap" test that it is in fact glass.
Because I'm using Waterlox Marine, which has mineral spirits in it, I'm concerned about the "glass" with the overflow of Waterlox on it. If its actually polycarbonate, I've read that MS can cloud it up. Is there a way I can test to make sure it's actually glass, other than trying to scratch it?