A guy I helped build a dock for the river years ago had a anaerobic polyurethane sealant that was made for plastic barrels... It was a one part and I don't think we used a primer, but we were drinking!!!
It took for ever to dry but never leaked.... Years later he sold it and bought an old metal pontoon boat deck to replace it... He said many times he wished he would not have done it.. We put air chucks in that to keep it from sinking.. About once a week he had to refill with air to push the wAter out of the pontoons..
He finally got an aluminum one that doesn't leak..
Texted him to see if be remembered what it was, but he is not sure... He thinks it can from John Deere or a fertilizer company?
