I currently have my 72 stardust Cruiser in the dry for a bottom job. The boat has three discharge outlets that are either under the waterline, or right at the water line. I'm thinking about having all three outlets welded over and put everything (head, shower, sinks) into the holding tank. I have slip pumpout so this is not an issue. My thought is that closing off these outlets "could" prevent taking on water in case any of these outlets ever rust through.

Thoughts, comments, and advice?

p.s. There's only two of us that stay on the boat (weekends), pretty good size holding tank, and pump out is easy.