Flexiglass Encapsulating Primer 5Kg G20/Flexiprimer5What is Flexiglass Grp multi surface overlay? Cromar Flexiglass is a liquid applied roofing product designed to work on a variety of existing roof surfaces, providing a hard wearing and rapid cure solution. Flexiglass is full compatible with our range of GRP Trims and accessories. Application of Primer: It is important that the products are mechanically stirred in the tin, prior to pouring into mixing buckets. Add the required Flexiglass catalyst