I am repairing a 1984 Macgregor 25 and in my searches for styrofoam, I came across spray in flotation foam similar to the insulation foam that you use in houses. I am considering using it in place of the blocks since it will be able to fill in spaces that the blocks can't. If the foam actually does work to keep it afloat, then this will allow me to be able to use some of the space that the blocks take up for additional storage and stilll have foam around the area. Just a thought at this point.
Styrofoam Blocks
- Thread starter Triple Point
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I have some experience with that foam. Make sure that you lay it in so that it gets enough exposure to the atmosphere so the reaction goes off. If you spray enough into a closed space it does not turn to foam. It is very messy and very difficult to remove from skin. But it is a great product and I have used it to help mount items so they cannot shift.
I was just pondering.
The white part of my rudder assembly must weigh around 10 pounds when out of the water but I have to push it down to lock it in place, so my question is......
How much does a mac weigh when submerged?
I weigh 200 pounds when on the scale in the bathroom but I float in the water!
Hummmm
I also have experience with this. IF it is immersed in water, it will hold water. (oil is even worse).
(fwiw, I had a 15 yr old skiff with the 2 part foam, and it was soaked with oil and water... made the boat heavy...)
if you can put it in a garbage bag, then it will not soak up water.
-it takes a while for it to soak up water and oil, and if you have a skin that helps. (ie cutting it after it sets up exposes the sponge part).
closed cell foam FTW!
That said, I used some in the laz top (roof), and in some behind the bow eye, where water will not sit.
as long as its not in the bilge it should not absorb water
I wouldn't add the spray foam
On more than one occasion I've removed my foam blocks of foam for easy access to the back of the boat. Spray foam seems much more permanent.
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