Waterproofing plywood?

[MrQwerty]

I built a 9'X3' and 5" tall "Hempy bed" with pond liner & idk if there was a puncture from the plywood table that I built or if the liner was defective. I checked for leaks but could not find the source. I cant afford another leak X0..... I am just glad it managed to seep through the wood before I took off for 3 days(another ten minutes and I would be gone) Its a great design but I guess I doubted the strength of a pond liner which is meant for outdoor application. Anyway I have seen plywood fish tanks and they are usually sealed with some sort of roll on product. Can someone recommend me a good product to accomplish the task? It should be possible, if a fish tank with 200+ gallons can be sealed & not kill the fish, then it should be possible with my drip system. The tank cant have much more than 1" of water, so there is not much water pressure. I built the tank while attempting to keep it light. Thin plywood & thin frame = flimsy table. I need something that is able to give as the table shifts if I move the rig around. I was thinking some sort of rubber composite? Maybe used in roofing? I have seen one called Liquid Rubber, basically a roll on rubber. The simular aerosol products are obviously more expansive and I would like to attempt to keep the 27"+ application as cheap as possible(not including the 5"walls), I just wasted $30 on a pond liner . As always Thanks alot.

 

[Lammy]

I don't know the answer to your question but pond liners can be patched if can find the leak. Whatever you use for your rez I would make it food grade at least.

 

[avant gardener]

search "pond sealant."
there's dozens of different ones.
i think the the one i used was called pond armor.
it's relatively inexpensive and it got the job done.

i'd strongly advise against using henry or liquid nails or any other general roofing/construction sealant. a lot of them offgas as they cure and release chemicals that are toxic to either your plants, your patients or both. get something that is expressly labeled as safe for potable water or agricultural use.

 

[Scottish Research]

Look for some pool paint. It is waterproof and low VOC. Try home depot.

R.Fortune

 

[foomar]

Built a similar custom sized tray from fibreglass resin and matting , never leaked or split despite being 3 mm thin and a bit floppy , 20 years of HPS has not degraded it much.

Could use this material to line the wooden former , will bond permanently to the wood and retain enougth flexibility to resist cracking , and stiffen the whole structure.

Approx one off cost forty pounds useing reprocessed resin and low grade mat from an industrial supplier , dont need top quality materials for this spec.

 

[wrongwrong]

I was thinking some sort of rubber composite? Maybe used in roofing? I have seen one called Liquid Rubber, basically a roll on rubber. The simular aerosol products are obviously more expansive and I would like to attempt to keep the 27"+ application as cheap as possible(not including the 5"walls), I just wasted $30 on a pond liner . As always Thanks alot.

a lot of people use the liquid rubber in shower units I think they use laticrete hydroban mostly, as a liquid membrane.. on roofs they use a polyethylene membrane..

 

[Cannabinoholic]

You could try a high grade marine sealant. I also second the fiberglass resin idea. But with anything, allow a week or so to offgas.

 

[CannaBunkerMan]

Shelack/bar top.

 

[ChaosCatalunya]

Built a similar custom sized tray from fibreglass resin and matting , never leaked or split despite being 3 mm thin and a bit floppy , 20 years of HPS has not degraded it much.

Could use this material to line the wooden former , will bond permanently to the wood and retain enougth flexibility to resist cracking , and stiffen the whole structure.

Approx one off cost forty pounds useing reprocessed resin and low grade mat from an industrial supplier , dont need top quality materials for this spec.

This.

++ You do not need to use any fiberglass matting, the resin alone bonds perfectly to the wood. Do all the sides while you are at it.

All liners are vulnerable to holes, you have to be careful when cleaning, etc, whereas resin finished wood is virtually indestructible

 

[shlank]

elastomeric paint its a stucco brick masonry paint works great on DIY plywood planter beds really rubber like stuff flex's with the plywood.
If your really worried about the sides leaking marine caulking is a great sealer for everything even cures underwater draw back it takes a long time to cure out.

 

[serious6]

i use 6mm panda poly covering 1 side and overlapped to staple the back with 1/2" size sq. stables. do my flower beds the same way. no leaks in 10 years and can patch with poly and tuck tape if need be. can put sides up as well done same way and screwed in. hope this helps

use a staple gun...............

 

[OneTokeOver]

We call it blueskin in the trades but Mapei "Mapelastic" is what I use. Roll on 2 coats and water proof.

http://www.rona.ca/shop/~membrane-waterproof-membrane-mapelastic-411399_mapelastic_tiling_shop

 

[MrQwerty]

Ok, it seems like fiberglass resin is the answer.. Does anyone have a product name that they used? that is for sure non toxic... oh yea and that can be purchased at lowes/home depot preferably.

 

[omni]

2 component polyurethane or epoxy

 

[serious6]

fiberglass; get a respirator. panda poly comes in 2mm, 4mm, and 6mm and 10' x 100' rolls; cheap and long lasting. can make walls too

 

[shredGnar]

grace water-proofing... very popular among construction.. super expensive but it's because it's good!!

http://www.homedepot.com/webapp/wcs...ping-_-googleads-_-pla-_-202800772&ci_gpa=pla

 

[MrQwerty]

I went to lowes and the only fiberglass resin product they carried was 3M I called 3M tech support & their product offgasses ... Can someone give me a specific product & location where it can be purchased?

Shred: I would like to keep the spending to a minimum . I have already invested a lot & I would be pretty happy if I can keep this expanse under or around $50

 

[Scottish Research]

MrQwerty: Your last comment was very inappropriate.


Anybody interested look up Rubberizit.com

Their product will seal your plywood.

No off gassing. Approved for horticulture applications.

Your looking at about $40 to $100 total price shipping included.

They told me that 1 gallon will cover 72 sq feet. 2 coat min needed.

I'm in the process of making my own ebb and flow table.

This will work.

Good luck!


R.Fortune

 

[MrQwerty]

bad choice of words. I did not mean to offend. I'm sorry about that. Thanks for the advice checking it out.

 

[MrQwerty]

I found a sherwin williams who said they have an $80 dollar gallon of "0 VOC Acrylic" that needs to come off the shelf, they will let iit go for $25. I explained the situation with my "organic tomato/veg" garden & how I will consume the fruit & he said it will be fine. What do you guys know about this 0 VOC acrylic?