What Flexpat says is correct. I've had no experience with the 20'ers, only the 23', and the inner skin was very thin, outer skin a different story, very thick. Remember I took off the outer skin on my transom. I would do as others suggest, lay a layer of 1708 on the inner skin, cover every hole, tuck the 1708 in in the corners. Arjay is bad ass stuff, however it will find any hole you have. The holes such as the "D" rings on the transom I just used a 2" x 2" duct tape on those.
Just for grins I looked at the price of the Arjay at FGCI in St. Pete yesterday while I was there, it was $180 for the 5 gallon pail, I have the catalog from 2009 and I paid just less than $120. Ouch!
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