- Failure to properly prime and seal the wood before painting
- Using the wrong primer type (non-stain-blocking)
- Moisture present in the wood at the time of painting or seeping in from behind
Causes:
RECOMMENDED SOLUTIONS
- Identify and eliminate any source of excess moisture (e.g., leaks, open joints, unsealed gaps).
- Thoroughly clean stained areas with mild soap and water, then allow them to dry completely.
- Apply one full coat of a stain-blocking primer to seal tannins into the surface.
Finish with one or two coats of a premium exterior paint, ensuring proper coverage and film thickness.
