Profile: MGM Supply Company specializes in offering interior steel framing products. We also provide drywall products and tools. We also offer wall & ceiling boards, textures, plasters & coatings, joint finishing compounds, glass mat gypsum boards, decorative mouldings and joint reinforcement. Our joint finishing compounds include heavy repair setting compounds, which are chemically setting powders used to prefill joints, embed mesh joint tape & conceal joints, fasteners and trim accessories on gypsum wallboard.