Profile: S T M Industries offers molded composites and fiberglass. Our products include umbrellas & seating styles, laboratory sinks & counters, water skimmers & weirs, seaplane hulls & parts, boat parts and in-line skating rinks. Our skimmers are made with special vinylester resin to stand-up to any tough aquatic environment and coated with gelcoat to match color needs or to blend into the location.