Seeing Spots

Telltale Bleed-Through: Water-soluble pigments in wood sap migrate through acrylic paint, leaving unsightly spots on the painted wood trim.

Wash or Strip, and Repaint: Since the sap bleed-through is water soluble, you may be able to remove it with soap and water (and a little bleach). But sap pigments can bind themselves to wet paint. If the stain won’t wash off, you may have to strip off paint before recoating.

Sealing and Priming: Shellac will block wood extractives—but in outdoor conditions, it needs help. Prime the whole job with a good stain-blocking primer. Then, seal just the knots with three to five coats of shellac. Finally, apply a high-quality top coat of paint for a stain-proof “sandwich.”

Join the Discussion

Please read our Content Guidelines before posting

Close X