Re: 19 7/16 X 19 7/16 Bomar 100 replacement options
My problems are not so bad as yours. All I have done is put stainless helicoils in all (or almost all) of the corroded bolt holes for the props and dab on some new paint. I think I have now done all four bolt holes in each of the two large hatches (saloon and vee berth) and in the smaller hatch (head). I've delt with plastic to aluminum joint leaks with windshield leak stuff in a tube from Advance and replaced the rubber gaskets on all three hatches.
After your note I'll pay better attention to the bubbles under the paint. The devil may be lurking there.
1988 PSC 34