Originally Posted by
Bulldog123
http:///forum/post/3067050
Weld-on is professional acrylic bonding agent. And yes it reef safe. I made a fish trap using it and its in my tank right now. Trust me silicone is not the same. Weld-on is a chemical that makes the two acrylic peices one. This is not a glue.
I agree. If you are using true acrylic, then the Weldon brand of products is the best. I have built several sump/refugiums with multiple compartments. Use Weldon #3 (thin as water) to 'melt' the acrylic together and Weldon #16 (thick as model glue) to make a small seam to guard against leaks.
Completely reef safe. The #3 will strongly bond two pieces of acrylic in 15-20 seconds!