Originally Posted by
bmkj02
http:///forum/post/3202912
On my 55g freshwater tank I got a 1/4" acrylic strip and used Weld-on and attached it. Never had a problem. Acrylic and plastic is easier to bond using Weld-on. Attaching a glass piece to plastis using silicone is not going to hold very well being that you are attaching glass to plastic and its under pressure. Glass to glass yes or plastic/acrylic to plastic/acrylic yes.
Exactly. The silicon you've used to bond the glass to the plastic frame will have no strength.
IMO, your options are going to be to junk that brace and make a new one out of acrylic, using a plastic adhesive. I'm not sure weldon is the best choice here because weldon works best when bonding two identical materials. I'd use a glue that is rated for plastics.
Alternatively, you could try to mount the brace on the underside of that frame where you can use silicon to bond to the glass of the tank. That *may* work.
You could also order a whole new plastic trim from the tank's manufacturer.
Do you have a table saw at your disposal?