Quote:
Originally Posted by PapaDave
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I was reading
this thread on iboats.com about using Great Stuff for Marine applications. This one guy made a lot of sense. Take it for what it is worth. "Great stuff is great for sealing up around doors and windows in the house but for what you are intending I would say it sucks. Take one can of it and try to fill a one cubic foot cardboard box. Ain't gonna happen. On top of that it will be wet forever in thick sections. The pourable foam expand much more and is a two part mix that cures solid in about 15 minutes. It is worth the extra money but I don't think there is extra money."
I have researched the 2 part pour foam for one of my projects. It is the recommended type of foam for marine applications. It comes in different weights; 2lb, 4lb, 6lb, 8lb, etc. The weight refers to the weight of 1 cubic foot when using each of those foams. The heavier the foam, the higher the density and the harder the foam. The 2 and 4 lb density foams expand the most and are used for flotation. Here's a
link to a SD company that carries it. Check out the FAQ if you have any questions. 1 cu ft of 2 lb density foam will float about 60 lbs, so your kayak would take about 1 cu ft of this foam. You would need the 1/2 gallon kit (1 qt of part A and 1 qt of part B) of the 2 lb density foam since it makes 2 cubic feet.
You have to work fast with it. After about 20 seconds of mixing, you have less than a minute to pour it before it starts to rise. In 3-4 minutes it is getting hard.