five star

Borate-Glycol Wood Preservative

Shell-Guard provides the ultimate protection against insects and wood rot for your log home. This new generation of preservative combines the well-known effectiveness of borates with a glycol system that increases the penetration into the wood to enhance the action of the borate.

Shell-Guard is colorless and odorless. The glycols used are the same type as those found in many food and skin care products.

Shell-Guard is a concentrate that is mixed with an equal amount of water, then applied to bare wood with a brush or as a spray. Once in the wood, it will kill those insects that eat wood such as wood boring beetles and termites. It also kills the types of fungi that are responsible for rot and decay. Shell-Guard makes wood toxic to wood destroying organisms!

The best thing about Shell-Guard is that one application will last the life of your home as long as the exterior surfaces are maintained with a quality, water resistant stain such as Lifeline.

(Shell-Guard Concentrate is not available in Canada)

Made in U.S.A. Made in U.S.A.

Sizes & Prices

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5 Gallon 2.5 Gallon 1 Gallon
$447.76 $243.17 $134.76
shellguard5gal200x200 shellguard25gal200x200 shell guard


Shelf Life

  • 5 Years

Application Temperature

  • 40° to 90°

Application Methods

  • Low pressure sprayer
  • Brush
  • Drill holes and inject

Surface Preparation

  • Clean and dry
  • Bare wood
  • Free of mold and mildew


  • Permanent in wood that is kept sealed
Special Instructions
  • One coat application
  • Rinse surface before finishing

Drying Time

  • 1-4 weeks, depending on weather conditions
  • Recommend 2 weeks, then lightly wash with Log Wash
  • Surface must be dry to the touch (free of residue) before finishing

Coverage Rate

  • 215 square feet per gallon of concentrate
  • Actual coverage rate may be greater


Coverage Rate

215 square feet per gallon of concentrate

Actual coverage rate may be greater


four star T Beck in CA (08/17/15) - "A little cheaper if you mix up the concentrate yourself instead of the ready-to-use stuff. Took longer to dry than I expected, but company rep said the concentrate gives the best protection of all products against wood eating bugs."

five star S Craig in MN (07/30/14) - "My girlfriend and I bought a foreclosed conventional home that had major water damage in the master bedroom area. I asked around for different products that would help stop the rot from continuing and was given Perma-Chinks number. We purchased the Shell Guard Concentrate and applied to the entire crawl space. We then also removed all the paneling and cardboard ceiling squares (home built in 1974) and applied the Shell Guard there as well. This product is easy to use and no worries around your pets and kids. I have recommended this to many of my friends and feel this is something any household can use in preventing rot. Thank you."

four half star B Gordon in GA (06/24/14) - "We had an infestation of powder post beetles on one side of our home. We were told by our neighbor that Perma-Chink Systems had a preservative that would take care of it. We applied the Shell Guard Concentrate and had to wait a couple weeks for it to dry before staining. We noticed over the next several months that it had to be working since we didn't see as much dust around the holes. It has been a year now and everything is great! I would recommend this product to anyone if they are having issues with insects."

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