Silicone on acrylic?

[isde02]

Is silicone strong enough to seal a overflow in a acrylic aquarium?

 

[GeraldM]

No I would never use silicone for acrylic. Instead get some Weld-On 16 Acrylic Cement. You can get it cheap on ebay or amazon and it forms a permanent seal.

 

[wednesday13]

Weldon #40 is 30 times stronger than #16...says so right on their website. Most all tanks are built with #40. #16 is good for small repairs but it is brittle, full of bubbles and can start breaking down after a few years. Silicone does not adhere to acrylic so thats a no go. For the job ur doing id order a pint of weld on #40 or a small kit of #42. #42 is the same as #40 but comes in an epoxy type applicator that mixes it for you. Either glue should cost around $16-40. I think #16 is junk, i used it for years and watched it fail, later re-repairing my old work with #40. People on here swear by #16 but its cheap, readiliy available and they just dont know any better, its not their fault lol....

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[Dan F]

If it needs to hold water, no. If it is to attach an internal overflow box it would probably be fine, but using acrylic cement would be much better. The only benefit I could see is if you want to remove the weir in the future you could pull the silicone loose.