Spal-Pro SPF/SPF-P is a water-based, one-component liquid that, when dry, creates a thin film. This film creates a protective seal over concrete to prevent or reduce staining caused by joint filler and joint sealant overfill. SPF/SPF-P can be used to protect conventional concrete, colored concrete, stained concrete, tile and other surfaces. SPF will prevent staining by most epoxy fillers. SPF-P will prevent staining by most polyurea fillers.