waterproofing plywood - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 12-15-2010, 10:24 PM Thread Starter
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waterproofing plywood

So i just received my custom built stand and I guess i failed to ask what materials would be used.

The top where the tank sits is plywood and the base of stand plywood. great....

I have just planned one caulking and sealing this stand since I had expected all regular wood but this has now thrown a wrench in the works.

I googled and everyone is suggesting exotic epoxies and stuff. No thanks.

Any products available from local stores worth looking into? I assume epoxie is best but is it compatable with caulk so I can fill in the gaps?

Any types on application of whichever product you recommend?

thanks
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post #2 of 11 (permalink) Old 12-15-2010, 10:32 PM
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There should be no need to completely "waterproof" a stand. So long as it is plywood, and not particleboard, you should have no problems. If it is exposed to enough water to cause you problems, you will have another issue... cleaning water off of your floor.

A good coat of paint or sealer and you should be fine.
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post #3 of 11 (permalink) Old 12-15-2010, 11:15 PM Thread Starter
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wont the plywood obsorb the water and make the glue seperate?

I read a post where a guy had a plywood box that got exposed to rain and the outside layers started seperating
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post #4 of 11 (permalink) Old 12-15-2010, 11:19 PM
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A coat of paint or poly coat or both?
It's the usual procedure.

And you fill any gaps with wood filler.


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post #5 of 11 (permalink) Old 12-15-2010, 11:22 PM
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Do you intend to expose your stand to rain? A few drops of water /= rain. I've used plywood dozens of times and short of catastrophe, never had a problem...

The normal paint, sealer, etc will do the trick.
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post #6 of 11 (permalink) Old 12-16-2010, 12:01 AM Thread Starter
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alright thanks for the feedback

spills happen. old stand had particle board ( yeah big diff) and it didn't do too well with spills
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post #7 of 11 (permalink) Old 12-16-2010, 01:24 AM
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Most plywood made today uses adhesives rated for outdoor exposure. The plywood getting wet occasionally should have no effect at all on the adhesive. If you learn to read the "code" printed on plywood panels you can easily tell which panels use exterior grade adhesive and which don't.

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post #8 of 11 (permalink) Old 12-16-2010, 01:40 AM Thread Starter
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perhaps I should call them and ask them to ask the builder what grade they used
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post #9 of 11 (permalink) Old 12-17-2010, 02:29 AM
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Just paint or polyurethane it.
For me, it would be worth the sealer, but not worth a phone call.
post #10 of 11 (permalink) Old 12-22-2010, 05:45 PM
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what about the deck finishes which are water resistance(can probably buy those in lowes/home depot)? Just an idea.
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post #11 of 11 (permalink) Old 12-22-2010, 06:47 PM
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If you use a deck sealer most suggest reapply every few years, or even annually. Most of their effectiveness is based on 2 ingredients: Oil to repel water (Linseed was the old one, maybe now they are using something else) and a UV protecting material. Neither of these are something that is useful in this situation.

If you want this effect, look into hardwood floor finishing products. I have made several stands and finished some with stains, and some with clear coating only. I did some plywood stands, but most are lumber.

For plywood I would use a high quality exterior paint with the longest warranty I could find. Does not need to be oil based, but it could be, if you can do the work in the garage or outdoors. Acrylic paint is not fun indoors, but is do-able.
Plywood is not usually so interesting that I would want to use a clear sealer sort of material.

Of course caulk, fill holes as needed before painting. Use all outdoor rated products.
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