Quote:
Originally Posted by Snaz
To ensure the glass is not tempered view it with polarizing sun glasses. If it is tempered, a pattern will appear, no pattern and it is safe to drill.
|
You'll need another polarized filter on the other side of the glass to see the pattern. For practice try the side and rear windows of a car for tempered and the windshield for untempered.
I've drilled a few tanks half full, but I wouldn't recommend it. Much better in the long run to start over.