Regular problem blocking

Definition

Blocking occurs when two freshly painted surfaces stick together when pressed against each other, such as a door sticking to the jamb or window sticking to the sill. Frequently, when one surface “breaks” free, it leaves paint from its own surface or peels paint from the opposing surface.

Causes

  • Pressing newly painted surfaces together before they have fully dried
  • Using slow-drying, oil-based paints that have been stored for long periods
  • Applying another coat of paint before the first coat is completely dry Applying excessive amounts of paint on a surface
  • Using a low-quality, water-based semi-gloss or gloss paint not designed to have block resistance

Solutions

  • If the area has never been painted, prime the surface with a high-quality primer.
  • If a blocking condition already exists, scrape or sand the surface to remove all loose paint. Clean off any dust or dirt and then prime the area with a high-quality primer.
  • Doors and windows should be properly adjusted for free and smooth operation before painting.
  • Use a top quality semi-gloss or gloss acrylic latex paint. Low-quality latex paints generally have poor block resistance, especially in warm, damp conditions. Acrylic latex paints generally have better block resistance than vinyl acrylic paints or alkyd and oil-based coatings. Alkyds, however, can develop superior block resistance as the film hardens.

Product Recommendations

Primer

Surface Recommended Primer
Natural Wood EZ-PRIME® Premium
Synthetic Wood ULTRA-GRIP® Premium
Masonry EFF-STOP® Premium
Ferrous Metal BLOC-RUST® Premium, White (Water Based)
Non-Ferrous Metal ULTRA-GRIP® Premium
Undercoaters INTER-KOTE® Premium
Non-Ferrous Metal

Interior

Desired Finish Recommended Product
Eggshell SUPREMA® Interior Eggshell Paint
Low Sheen SUPREMA® Interior Low Sheen Paint
Semi-Gloss SUPREMA® Interior Semi-Gloss Paint

Exterior

Desired Finish Recommended Product
Low Sheen EVERSHIELD® Exterior Low Sheen Paint
Semi-Gloss EVERSHIELD® Exterior Semi-Gloss Paint
Gloss EVERSHIELD® Exterior Gloss Paint

Low Odor|Zero VOC Interior

Desired Finish Recommended Product
Eggshell EVEREST® Interior Eggshell Paint
Semi-Gloss EVEREST® Interior Semi-Gloss Paint

Please note that these suggestions are provided as a service to you. We are unable to guarantee or be responsible for the results obtained by these procedures. If you have additional questions, ask any of our expert sales associates.