making plywood waterproof?

Geozander said:

Use marine ply!

Click to expand...

use that or a 5:1 mix of water and pva glue.

for your drain fittings, you need whats called a tank bulkhead fitting.
Lowes and Home Depot doesn't have them, but some plumbing
supplys, and Tractor Supply carry them in 3/4", 1", and 1 1/4" !
Get the 3/4" then get a 3/4"MIP threaded hose bibb at a hardware store.

http://www.tractorsupply.com/agriculture-farming-ranching/pumps-transfer/tank-pump-parts-accessories/tank-bulk-head-fitting-3-4-in--2125602

pond liner it is

whats so special bout the tank bulk head?

gives you a drain fitting for your res !

ahh i see now
youve been great help

you wouldnt know anything about bubblponics would you?

I think ur looking for' Wolmanized' its not waterproof but it is treated to resisted rot, mold and all that crap. I built my tables in my griw room out of it.

Or u can get synthetic decking witch is recycled plastic.

I'm tellin ya dude. build your box out of plywood then line it with red seal. simple as that.

The stuff you paint onto concrete ponds, i think its called g4. Its not toxic to fish. So i would imagine it would not be toxic to your plants.