I am building my own cargo trailer and looking for tips

[wpg manitoba]

I have a 6 by 10 foot utility trailer that want to convert into a cargo trailer. My question is this. I am using plywood all around and am wondering if using a good few coats of tremclad on the roof would be good enough to seal it against water. I know fiberglassing would be ideal but do you guys think 3 maybe 4 coats of tremclad do the trick? I have used tremclad on my plywood flooring in my boat and I have found that it seems to have good sealing capabilities. The only flaw I found was that the floor does take a lot of abuse causing scratches but since the roof wont have any sort of traffic/scratches I was thinking that it should work just fine.
What do you guys think?

 

[Woodonglass]

Any Paint is basically a poor Sealant and waterproofing agent. Epoxy would be the best way to go IMHO for a long lasting solution and THEN a couple of coats of the TremClad to protect the Epoxy from UV

 

[nwcove]

i wouldnt hesitate to use tremclad, but i would thin the first couple of coats so it soaked in well, then a couple coats of un thinned. the only issue i can see with it leaking would be the seams.

 

[Jeep Man]

IMHO, I personally would spring for thin aluminum sheeting for the roof. Use a good sealer where the sheets overlap and screw them down. Coating the threads with adhesive before screwing them in will keep them there.

 

[Scott Danforth]

I would recommend something a bit more sturdy than simply plywood and paint

we build the PODS pods at work for, its basically nida core with a gel coated surface on one side. lighter and stronger than plywood, impervious to most damage, and basically water proof. for the price of plywood and paint, I would suggest looking in that direction.

when building the last ice shanty, I came across a bunch of 30 gauge aluminum sheets. we glued them to the plywood with carpet adhesive and used aluminum tape on the seams. then used rustoleum to paint it so it didnt look like a giant can of spam.