What surfaces will spray foam not stick to?

Spray foam generally sticks well to most building materials including wood, concrete, metal, drywall, and masonry, but it does not stick well to certain surfaces that are oily, wet, dusty, or have low surface energy. Surfaces spray foam will not stick to or has poor adhesion include polyethylene plastic sheeting, polypropylene, Teflon or PTFE coated surfaces, silicone coated surfaces, oily or greasy surfaces, wet or frost covered surfaces, very dusty or loose surfaces, and surfaces with release agents or form oil. Spray foam also has poor adhesion to some roofing membranes like EPDM rubber unless primed, and to surfaces with standing water. For best adhesion, surfaces should be clean, dry, free of dust, oil, and loose debris, and within temperature range specified by manufacturer, typically 60 to 80 degrees Fahrenheit. Some manufacturers recommend priming certain surfaces. If surface is non-stick, you need mechanical fastening or different sealant. So spray foam sticks to most construction materials but not to slick plastics, silicone, Teflon, oily, wet, or dusty surfaces.