3M Fiberglass Matting Adhesive is a low viscosity two-part urethane used to saturate fiberglass cloth or mat when preparing backup patches. This adhesive may also be used for filling cracks, channels and areas restricting the application of an adhesive bead.Due to its excellent absorption into fiberglass mat or cloth, 3M Fiberglass Matting Adhesive is used to saturate fiberglass cloth and/or mat when creating backup patches for Sheet Molded Compound (SMC) and Fiber Reinforced Polyester (FRP). Examples of FRP include Fiberglass and Metton panels. If bonding reinforcement patches to flexible plastics or Metton use 3M Polyolefin Adhesion Promoter, part number 05907 before applying the patch. Typical Performance PropertiesThe following times have been determined with ambient air temperature and substrate temperature at 73°F (23°C) and are considered typical values. Our fiberglass matting adhesive has a mix nozzle dwell time of 9.5 minutes, work time of 10 minutes, sanding time of 45 minutes and cure time of 45 minutes. Bringing Science to the Art of Auto Body Repair3M is well known among collision repair professionals and others who are committed to helping you restore the beauty and value to your cars and boats. 3M Fiberglass Matting Adhesive is another way that 3M applies science to life – and helps you rediscover the excitement of the vehicles you own.