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It feels like there is a seam tape on the inside as well. I just wonder if I will be able to seal it up cleanly once I'm done. I've heard it mentioned that you need to make access through the seams when you need to replace valves and such but to gain access to paint the tube sealant on the inside of the tubes is another idea.
I wish I could simply roll the boat upside down.
Maybe strip her of all the electronics and capsize her at the docks and rock about for awhile with the sealant inside? Would it be hard to capsize and right a bare hull in the water?