Boat Building Foam

Written by Patricia Skinner
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The boat building industry has become one of the foam making industry's best customers for a number of reasons. Filling cavities on boats with spray on polyurethane foam aids flotation and insulation. Injecting high density polyurethane foam into the stringer system of your boat, however, will not just keep you afloat when the weather gets dodgy. It will also add rigidity to the hull so that your craft will actually withstand stress more readily. In addition, because it adds virtually no weight, foam is perfect for use on racing crafts of all kinds.

There are many marine applications for high density polyurethane foam besides improving the buoyancy of your boat. Wherever you need insulation or extra buoyancy you can use polyurethane foam. It is fast and convenient and cures in about five minutes as opposed to hours for single component foam.

Controlling the Application of Spray Foam

It's important to remember when filling small cavities with spray foam is that the harder you pull on the trigger of the foam gun, the faster the foam will come out. You will retain better control over the process if you keep the foam spray on a low setting. Your foam may also not expand as much as it should if you spray it too fast, resulting in flat foam. For large jobs you will also need to wear protective clothing including a covering for your head because the foam will stick to your skin and hair.

One thing to note when using polyurethane foam in any kind of outdoor setting, however, is that it should be covered in a layer of latex paint or some other coating product to protect it from sunlight. Failure to do this will lead to a rapid breakdown in the foam, as sunlight tends to make it turn yellow and very brittle. If you're using spray foam in an enclosed space there's no need to cover it with anything.


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