Yes, you should generally prime bare wood before painting it. Wood is porous and can absorb paint unevenly, while certain types of wood can also release tannins that discolor the finished paint. The right primer helps seal the wood, improve paint adhesion, and create a more uniform surface for your finish coats.
Previously painted wood doesn’t always need to be completely primed again. If the existing paint is in good condition and properly prepared, you may only need to prime bare or problem areas.
Why You Prime Bare Wood Before Painting
Bare wood absorbs coatings differently than an already sealed or painted surface. Applying primer first helps seal the porous surface so the finish paint can provide more consistent coverage and adhesion.
Primer can also help prevent substances naturally present in certain woods from bleeding through your new paint. This is particularly important with tannin-rich woods such as cedar and redwood.
How to Prime Wood Before Painting
- Clean the Wood: The surface should be clean and free of dirt, grease, wax, and other contaminants that could interfere with adhesion.
- Repair Any Damage: Fill nail holes, cracks, and other imperfections with an appropriate wood filler. Allow repairs to dry completely before sanding them smooth.
- Sand the Wood: Sand the surface as needed to smooth imperfections and prepare it for primer. Remove all sanding dust before moving on.
- Apply the Right Primer: Choose a primer designed for the type of wood and whether the project is indoors or outdoors. Apply an even coat according to the manufacturer’s instructions and allow it to dry for the specified amount of time.
- Sand Before Painting if Necessary: For projects where a particularly smooth finish is important, such as doors, trim, or furniture, lightly sanding the dried primer can help remove raised grain and minor imperfections. Remove the dust before applying your paint.
Do You Need to Prime Previously Painted Wood?
Not always. If the existing paint is firmly adhered and in good condition, you may be able to clean, prepare, and repaint the surface without priming the entire piece.
Any areas sanded or scraped down to bare wood should generally be primed. A primer may also be necessary when you’re dealing with stains, poor adhesion, a glossy existing coating, or an incompatible previous finish. Read more in our post about priming before painting.
What Kind of Primer Should You Use on Wood?
The best primer depends on the wood and the project. Acrylic primers work well for many wood surfaces, while an alkyd or other stain-blocking primer may be a better choice when you need to prevent tannins or other stains from bleeding through the paint.
Interior and exterior wood can also have different requirements, so make sure the primer you choose is approved for both the substrate and where it will be used.
Do You Need to Prime Wood Before Painting It White?
Priming is particularly important when painting bare wood white or another light color. Tannins and other discoloration from the wood can be much more noticeable through a light finish.
Using an appropriate primer helps block this discoloration while providing a more uniform base for the new color.
How Many Coats of Primer Do You Need on Wood?
One coat of the appropriate primer is sufficient for many wood-painting projects. A second coat may be necessary when you’re dealing with particularly porous wood, visible tannin bleed, stains, or another difficult surface condition.
Follow the instructions for the specific primer you’re using rather than assuming every wood surface requires the same number of coats.
Visit our Paint Stores for the Best Primer and Paint for Wood
Stop by Loconsolo Paints before starting your project. Our knowledgeable team can help you choose the right Benjamin Moore primer and paint for the type of wood you’re working with and whether you’re painting indoors or outdoors.
Visit one of our New York City paint store locations for stains, paint, primer, and everything else you need for your project.