Greetings. Just bought a 1975 C27 with outboard, and have been doing some work on it in preparation for launch next month. 1) The bottom paint looked like about 10-12 layers thick, and was peeling in places all the way down to the gelcoat. I am in the process of sanding, almost done. What I have done is take it down to the last coat over the gelcoat, and then remove any flaking paint down to the gelcoat. My rationale is I don't want to take off too much gelcoat by taking it all the way down. In some places I went through but not more than surface scratching, no deep gouges or fiberglass showing. Questions: Should I prime the bare gelcoat areas prior to applying bottom paint? I have a can of interlux micron extra that I was planning on using with 2 coats unless someone tells me a better idea. Also, I sanded with 40 grit to get the paint off fast. Is it ok to paint over this or do I need to resand with a finer grit? I do not know what type of paint is left of the hull, but it must be very old. Can this be painted over? 2) Related question: I sanded the paint off the keel, which I believe is lead. I went through paint into bare lead in a few places. Is any special prep required before painting the bare lead? 3) The knotmeter impeller has a broken vane. How easy is this to replace? The through hull fitting looks like it has a threaded locking nut on the hull side which is very tight. If I unscrew this can I replace the vane? Is this easy to mess up? Thanks for your help.