Join Date: Jun 2004
Location: West Michigan
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I plug the screw/bolt holes in my project boats with seam tape, it's butyl with a cloth or felt backing. For screwed in things, I simply clean the surface and apply the tape, for through bolted things, I use panhead type bolts, put the tape on, cut an X for the hole then place bolts in and snug them down from below.
I experimented with caulk and other things, but the seam tape is the best method I've found. caulk shrinks up and leaks after a short while, but the butyl seam tape lasts.