Glass microballoons are used to thicken and/or light most resins including epoxy, polyester, vinyl ester, and polyurethane. Glass microspheres are added to make a lightweight paste. They are easily sanded and will add strength and flexibility to the resin. You can add in fumed silica along with the glass microspheres to prevent sagging. We recommend pre-measuring the resin and hardener and mixing the glass microspheres in with the resin prior to adding the hardener to save your work life. Once the glass microspheres are thoroughly mixed into the resin, add the hardener. Glass microspheres are great when filling large gaps.
