R.M. Lucas Co. has added #8400 100 percent Silicone Roof Coating to its line of products. The #8400 is a low solids, single-part roof coating that creates a barrier that is resistant to natural weathering. The coating is durable, breathable, watertight and weatherproof. The #8400 creates an offering to the professional contractor who desires the performance of a silicone coating at a lower price point than Lucas #8000 100 percent Silicone Roof Coating High Solids. #8400 is suitable for application over spray-applied polyurethane foam, EPDM, PVC, aged acrylic coatings, concrete, asphalt BUR, modified bitumen and metal.