720gallon plywood build?

[sashimimaster]

At 29" tall you don't need any framing. Mine is 36" tall with no framing and 4 layers of fiberglass and it's solid. No flexing or bowing anywhere.

The weight of the cloth mat depends on how good you are a glassing. For curves you should stick to lighter weight. Thicker cloth is more difficult to wet and work with. I would go medium to lightweight and just add more layers.

 

[Redtailedcat]

At 29" tall you don't need any framing. Mine is 36" tall with no framing and 4 layers of fiberglass and it's solid. No flexing or bowing anywhere.

The weight of the cloth mat depends on how good you are a glassing. For curves you should stick to lighter weight. Thicker cloth is more difficult to wet and work with. I would go medium to lightweight and just add more layers.

how do you suggest i put the bottom panles and side panels togeather? wood glue the joints then fiber glass the joint cause ill need to 8x4 ply wood sheets for the bottom

 

[sashimimaster]

You can just screw from the bottom up into the side. That way the load is perpendicular to the screw instead of pulling on the threads. You can get a lot of hints from my build or others.

 

[CJH]

both

I just did a quick check and couldn't find the weight rating for the Bondo fiberglass. I'm sure that will be fine, just be sure to find the weight rating. I agree with the previous poster who suggested multiple layers of light cloth vs. few layers of heavier cloth. Whatever you do, avoid using fiberglass mat or roving. Cloth only in fiberglass tanks, especially if this is your first time. Don't be swayed by the cheaper cost of mat as you end up using more resin to wet it out.

As far as the Bondo resin, that's just a typical orthophthalic polyester. I'm sure if you shop around you can buy a higher quality isophthalic for the same price per quart as the Bondo stuff.

And if you find a supplier of resin they'll probably have a wider variety of cloth to choose from.

 

[fishmanbob87]

If u are going to fiberglass. Look into west systems epoxy. For sure the highest quality resin available to the public.

 

[Redtailedcat]

If u are going to fiberglass. Look into west systems epoxy. For sure the highest quality resin available to the public.

at this point looks like im gonna fiber glass the seams then liquid rubber the inside. easy and very cost friendly

 

[sashimimaster]

at this point looks like im gonna fiber glass the seams then liquid rubber the inside. easy and very cost friendly

It wouldn't hurt to fiberglass a few strips along the side walls too and while your at it paint all exposed wood with the resin to seal it. IMO the resin is a better waterproofer since it soaks into the wood instead of clinging on top like rubber.

 

[Redtailedcat]

It wouldn't hurt to fiberglass a few strips along the side walls too and while your at it paint all exposed wood with the resin to seal it. IMO the resin is a better waterproofer since it soaks into the wood instead of clinging on top like rubber.

what resin would you recommend?

 

[sashimimaster]

what resin would you recommend?

I got mine from US Composites. I think I listed it earlier as the 3:1 Epoxy type.

 

[mbsplit2]

I have a question. Instead of liquid rubber i'm thinking of using pond liner.