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Expert Advice: How to Paint Trim

Door and window trim -- as well as baseboards, cornices, moldings, and chair rails -- make a major design contribution to the style of a room. Our instructions for how to paint trim will help you achieve a look you love.

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Preparing to Paint Trim

Whether finished with paint or stain, trim must be properly prepared. This normally means setting nailheads below the surface of the wood, filling and sanding holes, cleaning, and repairing or replacing damaged wood. It can also require the removal of old paint or varnish to provide a fresh surface for the finish.

Whether you finish your trim before or after painting the walls, it's best to have all the preparation work completed on both the trim and the walls before finishing either surface.

Be sure to wear protective glasses when stripping, and a dust mask when sanding. Chemical strippers can contain toxic fumes, so ventilate the room adequately before applying the stripping solution. Rubber gloves are also a must to keep the chemicals from burning your hands.

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Test for Lead

Lead is a hazardous material used as an ingredient in paints before the late 1970s. In 1978, legislation banned its use, but your house could still contain lead paint. There are prescribed precautionary steps you should employ in the removal of lead paint, but in some cases you'll need to call a professional to stabilize or remove these materials.

The best ways to abate lead-paint hazards in your house include:

  • Paint removal: Scrape paint from peeling walls and woodwork with a broad knife. Wear a respirator as you work. You can apply chemical paint strippers to soften the paint. If you dry-scrape the paint, mist the surface with a spray bottle to reduce hazardous dust. Clean up dust and particles with a wet mop -- vacuuming it spreads lead dust. Sanding, sandblasting, and similar methods aren't recommended because of the dust hazard.  
  • Encapsulation: Instead of removing the paint, isolate it or seal it off. Apply new drywall over an existing wall or float the wall with wallboard compound.
  • Surface replacement: Remove and replace woodwork and moldings that have been painted with lead paint.

Remove Gloss and Fill Nail Holes

Remove Gloss: New paint or clear finish will not adhere well to gloss paints. Scuff-sand all glossy surfaces with 150-grit sandpaper. Use a sanding block or palm sander on flat surfaces or a contour sander on curved surfaces.

After scuff sanding, the surface will contain microscopic dust particles left in the grooves by the sandpaper. Pull these particles off the surface with a soft cloth dampened in mineral spirits or water. Don't use a tack cloth; it can leave a residue that will interfere with the paint bond.

Fill Nail Holes: Use the right size nail set to push nailheads below the surface of the wood. Set the point of the nail set in the recess of the nail head and tap sharply with a hammer. If you will ultimately paint the surface, slightly overfill the nail holes with interior wood filler. Sand it smooth when dry. For clear finishes, buy different colors of putty and use the one that most closely matches the finished tone of the wood.

Patch Trim for Painting

Wash the surface of the trim with a TSP solution or a low-phosphate household cleaner. Rinse thoroughly with a vinegar/water solution, and let the trim dry. Use a stiff putty knife to scrape loose paint to the bare wood.

Apply high-quality latex wood patch in nail holes, dents, and other damaged areas. Overfill the area slightly to accommodate its tendency to shrink. Let the filler dry.

Sand the repaired area smooth with 150-grit sandpaper. If the filler has shrunk below the surface of the wood, reapply another layer and sand it after it's dry.

Sanding Trim

For large or small flat surfaces, a palm sander or random orbit sander is a great time-saver when sanding walls or woodwork.

Contoured surfaces are difficult to sand with rectangular sanding blocks because they can gouge the wood. Use flexible sanding blocks or sanding sponges to smooth these curved surfaces.

Walls or Trim: Which to Paint First

If you are an amateur painter, paint trim first, then the walls. This strategy will make it easier to sand, prepare, and paint all the details, edges, and planes of the trimwork. After all the coats of paint on the trimwork are thoroughly dry, mask off the trimwork with painters tape and paint the wall. Because you have masked the trim, any splatters from the wall will land on the painters tape, which will be removed later. Most professional painters would paint the wall first, then skillfully do the trim.

Tips for Door Paint

Tips for Trim Paint

Once you've completed all your prep work, it's time to paint trim. Prime trim with a primer, then topcoat the trim using either oil or latex enamel as desired.

Doors, windows, and moldings typically take a higher sheen than walls because they get more physical contact and need a tougher surface. In addition, a glossy surface accentuates the woodwork and makes it stand out from the walls. That contrast between trim and walls adds interest to your design scheme. Choose trim paint that's at least one step glossier than the walls.

Colorful Ideas for Painting Wood Trim

Consider Satin Paint

Satin paints display a light luster with a soft texture. They are more durable than flat paints and can be used for trim that won't get much abuse, especially when you want to set the trim apart from a flat-painted wall.

More Tips for Selecting Trim Paint Color

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