Half a gallon of wood glue, a pile of random, scattered resistors, or in [Ken]’s case, closed-cell silicone foam. Wanting to avoid this situation he set about trying to make his own silicone ...

Do I buy open-cell or closed-cell? Yes, there are two different types of spray foam, and they have two very different purposes. The differences have to do with the type of job that the foam will ...