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Keith,
All polyurethane foam is open cell and will, over time, absorb liquid. additionally, it sticks to anything tenaciously. It is ideal as an insulator. It is a fire hazard because it gives off toxic fumes. It is very popular with steel hull owners because of its ability to prevent inside condensation, which is the death to steel vessels. It should never be applied where it will see water. If used, it should be painted with a special waterbased fire retardant paint. This paint will protect the foam from absorbing splashed water and water vapor. If floatation protection is the reason for use, don't. Use hyperlon fabric chemically welded into custom airbags. You will not regret the slightly higher initial cost. Just remember to use padding on hard spots to prevent abrasion. Steve "keith" wrote in message ... Just a quick question. Is polyurethane buoyancy/flotation foam in aerosols the same as the polyurethane foam sold at builders merchants for sealing voids and cracks etc? The reason that I ask is that my local chandlery has aerosol foam that looks about the same if you read the ingredients etc on the tin, but the builders is cheaper. Keith |
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