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You can paint concrete with paint rollers. In fact, using paint rollers is considered one of the easiest ways to evenly apply paint on concrete. A paint roller with a 1/2- to 3/4-inch-thick nap—which is basically a fabric paint roller cover—is best for painting concrete. The thicker the nap, the more paint it can hold to fill those pesky concrete cracks and crevices.

In most cases, paint primer is necessary before painting over wood paneling. A hardy primer formula covers up stains and leaves a grippy surface for the new paint to hold onto. If you don’t use a primer first, you risk poor adhesion, visible blemishes, and a paint top coat that could flake away later. 

There are two primer choices: oil-based or latex-based. Choose an oil-based primer for durability and adhesion, but prepare for extra dry time and more VOC (volatile organic compounds) fumes. Or, pick a stain-blocking latex primer. They’re easy to apply, clean up, and affordable.

Yes, you can paint most wall panels. In fact, many wall panels come unfinished, meaning you can stain or paint them in any color you choose. Unfinished wall panels are usually less expensive than finished panels, although you should consider the time it will take you to finish them yourself when deciding if the monetary savings are worth it. You can save some money on the labor of finishing your panels if you go the DIY route, though.

If your wall panel already has a stain or paint color on it, you can often paint over it as well. You'll just want to make sure you properly treat the area before painting.

Yes, paint does go bad. How long a can of paint will last once opened depends on the type of paint and the storage conditions. If you take care to store it properly—sealed up airtight in a cool, dry spot away from the sun—your paint can last for several more years.