... .Sealant becomes elastomer after curing.One part,neutral curing silicone sealant.Excellent adhesion to most building materials without priming, ... metals, plastics, paints or concrete surfaces require priming with Silicone primers.Mask smooth surfaces to simplify clean-up, Remove ... replace caulking gun nozzle. Tool within20 minutes,NOTE;See Silicone spec Data sheet for detailed unused sealant in dry ...