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Old 05-25-2007, 10:01 AM   #11
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Quote:
Originally Posted by BillD
The question about the acrylic, can best be answered by knowwing the thickness of the acrylic. The real problem with acrylic is that silicone can not be counted on to seal it, as it doesn't stick to it the way it does to glass. Even using glass, the water pressure is a factor in maintaining the seal, but at least the silicone sticks to the glass.
what might he use instead of silcone?
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Old 05-25-2007, 03:37 PM   #12
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I think they bond the acrylic together into a seamless... "seam" (?)
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Old 05-25-2007, 03:45 PM   #13
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Originally Posted by tropicalfish
I think they bond the acrylic together into a seamless... "seam" (?)
ok, but 3 sides are wood
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Old 05-25-2007, 04:04 PM   #14
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Back to the fiberglass....that's what I would use to seal the inside corners, if not the whole inside of the tank. I read through the canadian thread and was surprised that he/she could not get a hold of two part epoxy, maybe we were talking about two different things but any marine supply store in the US will have tons of the stuff. It is absolutely waterproof, and can be painted afterwards (not sure specifically what kind of paint but again any marine supply store would be able to help on this). For glassing the corners, do a search on "stitch and glue kayak" (try www.clcboats.com)and you should find plenty of info on the technique.....plywood kayaks are built almost exactly the same way as a plywood fishtank would be built and boatbuilders have the methods pretty refined.
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Old 05-25-2007, 08:38 PM   #15
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Quote:
Originally Posted by BillD
The question about the acrylic, can best be answered by knowwing the thickness of the acrylic. The real problem with acrylic is that silicone can not be counted on to seal it, as it doesn't stick to it the way it does to glass. Even using glass, the water pressure is a factor in maintaining the seal, but at least the silicone sticks to the glass.
Water pressure is what keeps the glass in place. I am in the planning stage of building a 400G plywood/glass aquarium for Malawi Cichlids. There are many options for sealing a plywood aquarium. One option that I am looking more into is Sani-Tred. http://www.sanitred.com/ Another is Drylock.
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Old 05-29-2007, 08:37 PM   #16
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I read through the canadian thread and was surprised that he/she could not get a hold of two part epoxy, maybe we were talking about two different things but any marine supply store in the US will have tons of the stuff. It is absolutely waterproof, and can be painted afterwards (not sure specifically what kind of paint but again any marine supply store would be able to help on this).

Newfound, I am not sure the fiberglass epoxy resin you are thinking of is potable. I think it must be potable so as not to leach chemicals into the water column, but I am not sure... I know what you are talking about, and come to think of it, I know people use it to seal their styrofoam backgrounds, so that makes me wonder...
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Old 05-30-2007, 01:49 PM   #17
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It should be fine, there are many boats with built in fiberglass water tanks. Whatever coating was used, I'd soak it for a while anyway, with several water changes, just to be sure all the volatiles are gone.
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Old 05-30-2007, 02:23 PM   #18
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I thought he was going to put the glass on the inside of the tank, and that way maybe water pressure would also push it tight against the wood.

Boy was that nice. That rock really boggles my mind.
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