Has anyone ever re-sealed or re-rivetted a 19' Grumman square stern canoe? Creative methods for addressing leaking rivets?
I'm told that the rivets used utilize a sealant. Is this added, or a part of specialized rivets?
I procured this beast last year or so, and we cleaned about 15 years (literally) worth of tree pitch and pollen from the bottom, using nylon brushes and simple green, so as not to grind on the aluminum any more than necessary.
The motor that I have for it needs some TLC, and perhaps a touch more, but it moves quite nicely at higher rpm's (sometimes dies at trolling speed), and at slower speeds, the bushing (?) in the lower unit sounds like it could use a bit of help after 34 years of what was clearly intermitent hard use.
Once the pitch was removed from the exterior of the hull, and the aluminum was brought back to an adequate condition, etc., we took it to Paxson Lake, and trolled for lakers for a day.
Coming back after fishing, I noted that we'd acquired quite a bit of water in the stern of the boat.
I strongly suspect that there are rivets that are loose, and that cleaning away the 15 years worth of pitch/pollen/sap accelerated this feature.
We'd floated the boat before purchasing it, and at that time, there were no leaks at all.
I still need to suspend it on (stout) saw horses or blocks, and run some water into it, in order to see if I can locate any specific areas of leakage.
I've checked into spraying Rhino Liner in the inside of the hull (as a quick, expensive, heavy, but effective sealer), but due to the darker color of the Rhino-liner attracting the sun's heat, and the shrinkage that's caused by the colder water of the lake in re. to thinner aluminum hulls, the folks who've tried this before said, "Don't do it." It apparently works fine on thicker aluminum, but not on thinner aluminum.
Anyone re-rivetted or re-sealed a boat like this before? Ideas? Referrals to services? Costs?
I guess that I could take a lesson from the previous (original owner) of the boat (as well as from our ancestors) and re-seal the thing with spruce sap, but I'm hoping for a longer-term and more conventional (and less annoyingly sticky) fix, if there, indeed, is one..