Used to seal around services and for adhering FIREFLY Penowrap to substrates and to FIREFLYBatt. Brush Grade is used to butter up the cut edges of FIREFLYBatt prior to rejoining them around service penetrations. Once FIREFLYBatt sheets are installed, FIREFLYMastic is used to fill any small gaps and holes, creating a seal around the services.
