Western Colloid's #925 Clear Skylight Coating is a water based, clear, acrylic coating. It is formulated with premium acrylic resin, to form a hard, long lasting, clear surface on aged and worn fiberglass skylights. When applied properly it will give worn fiberglass skylights additional years of useful life. Clear Skylight Coating may also be used as a clear sealer on other surfaces such as wood and masonry. Not for use on acrylic skylights.