I have a 1996 23 foot O'Day and I have a few questions for the experts.1. What is the best marine paint and can it be rolled or brushed on.2. Where is the power scource, I see an electrical panel in the cabin, but how do I replace batteries for power, running lights, interior lights, etc.?3. The stern deck has benches, one opens up to a large storage area. I had to pump water out, found a metal plate at the bottom all rusted out. When removed more water in the hull with white insulating material soaking wet. I pumped out the water, should I remove the material and let it dry?4. Best material to refinish the wood on the deck and protect it. I heard Tongue Oil.5. What is the purpose of a stainless steel surounded hole at the water line on the out side of the hull?Robert