Different brands of spray foam have different curing processes. Be sure to check the instructions for the one that you have.
Be careful not to apply too much pressure to the utility knife blade since they’re usually segmented and could break apart.
Throw away the excess pieces of spray foam with your regular trash. [4] X Research source Always cut away from your body so you don’t hurt yourself if the knife slips. If the foam that’s applied in a corner, keep your blade flush against one of the walls and cut along the edge of the foam. Then reposition your knife against the other wall so you can cut the opposite side of the foam.
Metal scrapers work best for rigid foam that’s stuck on studs or are too large to cut with your knife. You can buy one from your local hardware store. In a pinch, you could even try using a serrated butter knife. [6] X Expert Source Josh GoldenbergResidential Remodeling Expert Expert Interview. 25 January 2022. Be careful not to hold the metal scraper perpendicular to the surface, or else you may damage or cut into it.
You can buy sanding blocks from your local hardware store.
Avoid cutting the foam before it finishes curing since you could damage the entire treatment.
If you have a reciprocating saw, you may be able to find blades made to cut through spray foam so you don’t have to buy a separate tool.
You can buy foam saw blades online or at your local hardware store. Avoid using the wrong type of blade on your foam since you could damage the saw or the insulation. Foam saw blades are usually around 18–27 inches (46–69 cm) long.
Keep your saw turned off while you’re positioning the blade so you don’t accidentally cut or damage anything.
You do not need to wear goggles or a ventilator when you’re working with cured foam. Dispose of the foam pieces along with your regular garbage. Be extremely careful when working with your saw since you could easily cut yourself and cause serious injury.
