PAINT, GLASS, AND WALLPAPER STORES (SIC 5231) Establishments primarily engaged in selling paint, glass, and wallpaper, or any combination of these lines, to the general public. While these establishments may also sell to contractors, they are known as retail in the trade, even if sales to contractors account for a higher proportion of the sales. Establishments not selling to the general public or known in the trade as wholesalers are classified in wholesale trade.