Spray foam becomes tack-free in 5 to 60 minutes and fully cures in about 8 to 24 hours, depending on the product and conditions.
Use serrated blades or putty knives to gently remove foam insulation, and for tougher areas, use a power drill or grinder.
Use R-13 or R-15 kraft-faced fiberglass or mineral wool insulation for 2x4 walls to ensure proper insulation.