What is the lighted foam that is waterproof. This needs to be put into my sailboat for bouyancy.?

Question

What is the lighted foam that is waterproof. This needs to be put into my sailboat for bouyancy.?

Answer 1

There is some that comes from a spray can, although there are commercial businesses that have a pump truck.  It is waterproof and I once used it in a wooden sailboat way back when.  Don't know what name they give it , though...

Answer 2

I would talk to someone at a marine supply or shipbuilder, rather than asking random strangers on a message board.