pvc board

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slr

Feeder Fish
MFK Member
Mar 2, 2014
15
9
8
Maryland
Has anyone ever heard of people using pvc board to coat a plywood tank. I would use fiberglass to bond the corners
 
Pvc sheet needs to be heat welded at the seams to create a water tite bond, solvents or fiberglass will not seal the pvc sheet. JohnPTC built a polypropylene tank with metal frame heat welded at the seams. I also lined my 650gal with polypropylene, heat welded it at the seams and put a liner on top. Pvc, Polypropylene, Polystyrene,ABS... all need to be heat welded inside and out to create a bond, solvents/fiberglass just don't stick to the oily nature of the products. Heat/plastic welders strong enough to do the job are $250-300 and up for starters, good ones closer to $800-1000. These materials are also a lot more flexible than acrylic and need to be supported differently.
 
I was thinking it would be less work and water proof I was going to install the pvc over the plywood. I didn't no if the resin would stick to it tho
 
No need for fiberglass when using a poly/plastic/pvc sheet. U can support the material with a wooden or metal frame and actually allow the plastic material to bend or bow a bit with the water pressure. If ur wanting to fiberglass, just fiberglass ur wood and seal it up with an epoxy paint.

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Yes most all petroleum based plastics need to be heat welded at the joints to make a bond. Since they are oily in nature theres not many things that will stick to them. Even if you just line ur plywood structure with one of these plastics using something like silicone or epoxy/fiberglass will not stick to the plastic and it will leak. You physically need to melt the sheets of plastic together at the seams with a heat welder and plastic rods to achieve a water tight seal.
 
Best to use known methods for plywood tanks. Even if you welded the pvc board one pin hole could destroy your tank over time. Use fiberglass and epoxy paint. It is cheap and works. I did my 750 gallon and used 4 gallons resin and 2 gallons epoxy. Been running for over 3 years with no leaks. I used sweetwater epoxy which comes in several colors if the color is what you are worried about.

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