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Silicone Falling Apart! Beautiful Piece

swimd

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so i built this beautiful center piece for my stingray tank, and after about a week, it is falling apart. i follow all instruction from others whom have posted on here about silicone, etc. but it seems like the silicone is not holding after a week.
 
i have the ricks that were sheets of a type of mosiac tile that was used, but all natural stone. i cut the panels to shape, and adhered with 100% "aquarium safe" silicone. attached is picture of silicone.
 
i used about 5 bottles.  the rock is attached to a plastic corrgorated board, which i have used in tanks before as sperators, etc.
 
please advise why my rocks are falling off! the close up pictures show the area where the rock is falling,.
 

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More pics of pieces falling off

silicone
 

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Your problem is that silicone is a sealant, not a glue.
 
You'd do better using either a pure cyanoacrylate superglue or a two part expoxy.
 

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