Before you load up a paintbrush or roller, the furniture surface needs to let you know what it’s up against. A greasy kitchen cabinet door requires a completely different prep process than a pristine drawer front, and a high-gloss laminate panel will react differently than bare, raw wood. Rather than assuming that the furniture needs cleaning, sanding, and priming, inspect the piece closely. Does it have dust, wax, flaking paint, gloss, scratches, bare wood, or any signs of an old finish that’s already delaminating? These telltale signs can clue you in to the prep your furniture really needs.
In most cases, cleaning is required if there is a chance dirt, oils, polish, or residue from hands and fingers will prevent proper paint adhesion. A piece of furniture can appear to be spotless, yet still be coated with a thin film that will cause issues down the road. Cabinet doors, drawers, handles, and corners that get lots of contact are prime suspects for grease buildup. Clean the surface using a mild detergent or degreaser, rinse the surface with fresh water as the manufacturer recommends, and wipe dry with a fresh cloth as appropriate for the surface and the cleaning product. Allow the surface to dry completely before you inspect it again. You don’t want to sand dirt, wax, or oil across the surface; it just spreads the problem. When both cleaning and sanding are required, clean first and sand second.
The role of sanding is slightly different. You don’t always have to sand the piece down to raw wood for a decorating project. Sometimes you simply want to dull the surface to take away the slickness, smooth out rough spots, feather small imperfections, or give the primer and paint a better surface to adhere to. Apply gentle pressure when sanding, especially on veneer surfaces, intricate details, and thin decorative elements. A sanding block helps you maintain an even pressure on large flat panels, whereas folded sandpaper gives you more control around corners. If you’re not sure how fast the finish comes off with your particular sandpaper, try it on an inconspicuous area before sanding across the entire face of the piece.
Primer is essential when you need better adhesion, a more uniform base color, or separation between an old finish and the new paint system. High gloss surfaces, laminates, exposed areas of mixed materials, and previously painted pieces with questionable adhesion are all cases where a compatible primer is highly recommended. Keep in mind that primer doesn’t replace the need for proper cleaning. You can’t expect good adhesion if you’re applying it over dirt, wax, or flaking finish. It’s also not a universal fix-all solution for every type of surface, so make sure your chosen primer is appropriate for the surface and the paint or protective coating you’ll be using over it.
A small sample section can sometimes be the key to solving issues that aren’t easy to diagnose through observation. Select a hidden portion of the furniture or a test board with a similar surface. Treat the sample board in the same way you’d treat the piece of furniture: clean, sand, and apply a coat of primer if necessary. Then apply a coat of paint to the test area. Wait for the paint to dry completely according to the manufacturer’s instructions and assess the coverage, texture, and adhesion. Look for any unwanted reactions, such as poor adhesion, peeling, an uneven sheen, or something else out of the ordinary. You can easily touch-up or start over on a small section, which is preferable to discovering your finish isn’t performing as you expected after painting an entire cabinet side or table top.
Rather than trying to complete the most extensive prep possible, focus on removing the obstacles that might interfere with the next layer while leaving the furniture underneath in good condition. A greasy piece needs thorough cleaning. A glossy, but clean panel may benefit from light sanding, and maybe some primer. A distressed finish with flaking old paint and varnish might need all three prep steps, done correctly. Run your hand over the dried surface and inspect it at an angle under bright light before you apply the base coat. When the surface feels clean and stable, and the preparation is uniform, you’ve created a great foundation for thin layers of paint and decorative finishing techniques.
