Re: 1964 Alpex Bali Rebuild
I'm not sure. I don know that it would need to be "closed cell" so as not to absorb and water. One of the pros will let you know shortly, I 'm sure. If you can use it, I would add some drainage channels along the bottom of the floor just to be safe. Water can/will always find away to get into every nook and cranny of the boat, which is ok, if it also has a way to get back out. There are actually USCG flotation regulations you can look up to see how much foam you'll need. Although, some vintage boats may be exempt from the reg, I would add as much flotation as possible. Kind of like old cars, they may not have been built with seat belts, disc brakes and airbags, but they're still a good idea. I believe the basic rule of thumb, is that 1 cu. ft. of foam will float 60 lbs., so if you had a 600 lb boat you'd want 10 cu. ft. of foam. Be sure to factor in your weigh, the weight of the motor and any guests and gear you anticipate carrying. Of course the flotation is only designed to keep the boat from sinking entirely. The boat can/will still get swamped if you take on water, but it should stay slightly above the surface. Hope that helps.