How to approach painting wood paneling so the finish lasts

Know what kind of paneling you have

Paneling comes in two broad kinds. Real wood boards, often tongue and groove, are solid wood that can be sanded, filled and painted much like trim. Boards hung with an open gap between them are shiplap, which our guide to painting shiplap covers. Sheet paneling comes in large panels with grooves routed or printed in, and some of it has only a thin wood veneer or a printed wood-grain surface over a backing.

Look at a cut edge, such as around an outlet or in a corner. Solid boards are wood all the way through; sheet paneling shows thin layers or a backing. It matters because a thin veneer can be sanded through in seconds, so the prep for sheet paneling is a light scuff, not heavy sanding. The same rule holds for veneered kitchen cabinets.

Some paneling has been painted before. That changes the job: the old paint has to be sound and dulled, not flaking, and in an older house it raises the lead question covered below. If the paint is peeling in sheets, that comes first.

Check moisture and age before you start

Basement paneling sits close to concrete and soil, so look for dampness first. The EPA recommends keeping indoor humidity below 60 percent, ideally between 30 and 50 percent, and says water-damaged materials need to be dried within 24 to 48 hours to prevent mold growth. Paint won't hold on a damp wall or fix a musty one. If the paneling is warped, water-stained or smells musty, solve the moisture problem first.

Age matters too. In an older house, the paneling and the trim around it may sit over layers of old paint. The EPA says homes built before 1978 are more likely to have lead-based paint, and its Renovation, Repair and Painting rule sets lead-safe work practices for paid work that disturbs paint. Mention your home's age when you call.

Cleaning comes first

Paneling collects decades of dust, cooking grease, smoke film and furniture polish, and paint won't bond to any of it. Wash the walls with a degreasing cleaner, rinse with clean water and let them dry completely. Pay attention to the grooves, where grime packs in, and to walls near a fireplace, a bar or a stove.

This is the step people skip, and it's the reason painted paneling peels. It's also how we approach every surface: cleaning, sanding, repair and primer come before any color goes on.

Sanding, repairs and the shine

Most paneling has a glossy clear coat. Paint grips better on a dulled surface, so sand the faces lightly or use a liquid deglosser, then wipe off the dust. On sheet paneling go easy, because a thin veneer sands through quickly and a printed grain can disappear in patches.

Fill nail holes and dents, and look closely at the joints. Panels move slightly with changes in humidity, so seams can open over time. Small holes are part of the prep we do before painting. A panel that's cracked through or coming off the wall is a different kind of job, and it's better to know that before the quote than after.

Primer does most of the work

Wood resin, tannins and old finish can all bleed through a coat of paint. Purdue Extension notes that the knots in many softwoods, particularly pine, hold an abundance of resin that can make paint peel or turn brown, and its advice is to apply a good primer to the bare wood first, followed by two top coats. Its guidance is written mainly for exterior house paint, but the wood behaves the same way indoors.

Dark-stained or knotty paneling is where bleed-through is most likely, which is why a primer made to block stains matters before a light color goes on. Skipping it is how a white wall ends up with brown spots a month later. Our guide to whether you need primer explains the options.

Primer type also changes the schedule. Dunn-Edwards says oil-based coatings can take four to eight hours to dry to the touch, and that professional painters may wait eight to ten hours, or overnight, before applying another coat. Latex dries faster, usually ready for another coat in two to four hours.

What to do about the grooves

The grooves are the biggest decision, and there are three ways to go:

• Leave them. Prime and paint right into the grooves, in the same color as the faces. The wall reads as a clean, lined surface, a little like board and batten. It's the least work and the most common choice.
• Fill them. Fill every groove, sand, prime and paint to get a flat wall. It looks smooth, but it's a lot of labor, and seams can show again when the panels move with the seasons.
• Cover them. A new surface over the paneling gives a flat wall, but that's a construction project rather than a paint job.

If you leave them, the technique that works is to brush primer and paint into the grooves first, keep each coat thin so paint doesn't run or pool in the recesses, and then roll the flat faces.

Making the wall flat is closer to drywall finishing than to painting. If that's what you want, say so on the first call, and George will tell you what he'd recommend for your walls.

Choosing the color and the sheen

Basements and dens often have little daylight, so the color does a lot of work. Lighter colors bounce back more of the light you have, and a warm white or soft greige brightens paneling fastest. A deep color can look rich on paneling, with the grooves reading as shadow lines. Our posts on basement painting ideas and painting over dark paint go through both directions.

For the sheen, satin or eggshell wipes clean in a room people use. A flatter finish hides surface flaws, which paneling has plenty of. If you're deciding between them, paint finish for each room lays out the trade-offs.

Trim, ceiling and the rest of the room

Paneling rarely comes alone. There's usually trim in the same dark stain, and sometimes a dark ceiling or beams. Painting only the walls can leave a room looking half done, so decide early what's included.

Trim in a satin or semi-gloss, in a lighter or matching color, ties the room together, and our guide to painting baseboards covers the details. Say whether the ceiling and trim are part of the job when you ask for a quote, because they change the schedule. Floors and furniture are covered before any paint comes out, which matters in a basement with carpet.

How long it takes, and getting it done

Paneling takes longer than a smooth wall because of the cleaning, the primer's drying time and the grooves. Most rooms take us one to two days, and a paneled room with an oil-based primer may need more, which George will tell you when he sees the space or hears about it on the phone.

Interior painting is priced by the square footage of the space, with paint included. The written quote is the price, no extra charge if the job takes longer than expected. We paint homes and businesses across Madison and Dane County, including Waunakee, and you can ask for a free estimate to talk through your paneling.