Houston is covered in paint, or it soon will be. With all the new dwellings going up in Montrose and Fourth Ward the past few years, the cans must be practically flying off the shelves at Southwestern Paint. Southwestern recently renovated its Montrose location, the one that's been there since 1940, and now has stores in West U, 1960, Katy and College Station. But besides selling to all those young Inner Loop homebuyers, it also stocks more than 50 brands of paints, coatings, finishes and accessories for a host of commercial concerns, from architects and contractors to hospitals and school districts. And if Southwestern doesn't have what you're looking for in stock, they can get it for you: The vast inventory on their Web site has just about every possible paint-related accessory you can imagine, like 14 different types of caulking guns. When you sling as much paint as Southwestern, you have customers who can put a use to every one.