16 Feb Hot Knife
While insulation foam is a great option for creating backdrops and other elements of a set; cutting it into desired shapes can be tedious. We’ve found that a hot knife is the best option for carving shapes, letters and other curved pieces of the set. If you are looking for a straight, clean cut then it is best to cut with a sharp utility knife.
NOTE: You cannot use a hot knife on craft foam core because it will burn the paper that is attached to it. A sharp utility knife will work for craft foam core. In addition, when carving insulation foam with a hot knife, a respiratory mask should be worn to avoid inhaling toxic fumes.
Here is an example of the process we use to create set elements that require a hot knife:
Projected image onto insulation foam
Carving the image
Painting the image