heres where iam starting

[Superminoh]

been a while but things are falling in place so I can work on the boat again. had a son pass away and it shut me down for awhile. have decided to use marine plywood and epoxy resin instead of the pourables.i have a question .can anyone reading this tell me how to tell if the foam that is in the boat now is closed are open cell.i can tell the boat set in the water awhile and shows a water line close to the top of the motor about 19 inches.and it appears the floor was replaced along the way. but all the foam I have ckecked has no water in it.dont want to replace it if I don't need to.