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Sealing Cut Ends of Pressure Treated Wood

Published in Wood Sealing 2 mins read

How to Seal Cut Ends of Pressure Treated Wood?

To seal cut ends of pressure treated wood, you should use a product specifically designed for this purpose. According to the provided information, Cut-N-Seal is recommended.


When you cut pressure treated wood, you expose the untreated core beneath the protective outer layer. Sealing these newly exposed surfaces is crucial to maintain the wood's resistance to rot, decay, and insect infestation, ensuring its longevity and performance.

Recommended Solution: Cut-N-Seal

Based on the reference provided (06-Mar-2018), a specific product is highlighted for this task:

  • THE ANSWER? CUT-N-SEAL.
  • Cut-N-SealĀ® is described as a water-based brush-on sealer and moisture repellent.

This product is designed specifically for sealing cuts and holes in pressure treated lumber where the untreated wood is exposed.

Where to Apply Cut-N-Seal

Cut-N-Seal is suitable for exposed cuts on various above-ground applications of pressure treated wood, such as:

  • Deck boards
  • Railing components
  • Post tops
  • Fence boards

Applying the sealer to these cut surfaces helps protect the core of the wood from moisture penetration and potential degradation.

Why Sealing is Important

Even though lumber is pressure treated, cutting it opens up areas that haven't received the full chemical treatment. These exposed ends are vulnerable points where moisture can enter, leading to:

  • Swelling and shrinking
  • Cracking or splitting
  • Reduced resistance to decay fungi and insects

Sealing these cut surfaces reinforces the wood's defense, maintaining the effectiveness of the pressure treatment.

In summary: Applying a dedicated sealer like Cut-N-Seal to the cut ends of pressure treated wood is a necessary step to protect the exposed, untreated wood and extend the life of your project.

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