New flotation bottles in, also built in fuel tank - previously ran off cans above deck, with fishbox below deck. Now nothing below deck except fuel tank. I decided against foam, because of stories of waterlogging - however, when we lifted the deck I had foam (and its still there) at the back in front of the transom, and it was bone dry; and it got water every time I went to sea. Just goes to show - if the foam mixed properly, no problem.