Quote Originally Posted by Bug_Power
Quote Originally Posted by matt
I'm not really following what you want to do, but if you're asking if silicone will seal an acrylic/PVC joint, the answer is no...silicone will not bond to acrylic, and probably not to PVC.
Got any prof that silicone will not bond to acrylic or pvc. you do realize that the overflow boxes are acrylic, abs or pvc sheeting glued to the side of your glass with silicone right? Silicone does not BOND to glass eitheron a chemical level. If the surfaces are prepared correctly they will and do STICK quite well! We have a 150 gal and a 180 gal setup with silicone holding the center ACRYLIC brace on!
Silicone holds overflows in place because the water pressure tends to push the acrylic/glass joint together, not pull it apart. I've never heard of an acrylic structural brace held to glass by silicone. Usually they're glass braces siliconed to the glass sides, sometimes with plastic trim parts that are somehow connected. I'm not sure what you're looking for in terms of proof, but I bet the cyro site has something to say about it. I do know from experience that silicone does not stick well to acrylic, and I certainly would not trust it to hold back a leak in an acrylic sump. There are cements designed for use in bonding PVC to acrylic, weldon #40 in water bearing situations and weldon #16 in non-water bearing situations. IME, weldon#16 does a very poor job of bonding PVC to acrylic with any strength, while weldon#40 does an excellent job.