Transforming a GRP composite door slab, PVCu profile or trim into a stunning real wood effect could not be easier. GrainEx has been matched to the most popular natural wood colours used in the industry today. GrainEx is a pre-mixed formulated grain enhancing solution They are solvent free, VOC free and odourless. They are easy to apply with a special sponge head bottle providing a permanent adhesion with minimal mess and waste. Totally UV stable.