DIY Wood sealant

Written by rhomylly forbes
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DIY Wood sealant
Protect your wood furniture from moisture damage. (aménagement extérieur image by Nath Photos from

With commercial wood sealants and preservatives costing up to £61 a gallon, homeowners with wood exteriors, decks or even wooden outdoor furniture want a way to preserve their investment from insects and moisture and still save money. You can make your own wood sealant at home with very few ingredients for far less than commercial products. Cook up an oil-based sealant for your wooden furniture and deck or an insect-repelling preservative that will keep your log home insect-free.

Skill level:

Things you need

  • 5-litre bucket
  • 2 litres white spirit or turpentine
  • 5/8 litre boiled linseed oil
  • 1 litre Penta concentrate 10:1
  • Paint stirrer
  • 115 grams (1/4 pound) untinted paraffin
  • Double boiler
  • Stove
  • Paint brush
  • Borax
  • Boric acid
  • Environmentally friendly antifreeze
  • Large pot
  • Clean gallon jugs
  • Garden sprayer

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  1. 1

    Mix the ingredients. Add turpentine, linseed oil and Penta concentrate, but not the paraffin, in your five-gallon bucket. Mix thoroughly.

  2. 2

    Melt and add the paraffin. Melt the block of new paraffin on your stove on low heat. Use a double boiler for safety. Once the paraffin is melted, add to the other ingredients and mix.

  3. 3

    Apply the sealant. Paint a light coat of your homemade sealant on your outdoor furniture, deck or trim. Reapply every three to four months in areas with significant rainfall or once a year for dry climates.

  1. 1

    Mix the ingredients. In a well-ventilated area and with the stove fan on high, add one gallon of environmentally friendly antifreeze (propylene glycol), 160 grams (3 1/2 pounds) of boric acid and four pounds of Borax to a large pot. Stir.

  2. 2

    Heat the solution. While still stirring to prevent boric acid crystals from forming on the bottom of the pot, slowly heat the solution to a rolling boil. Keep it at rolling boil for a few minutes.

  3. 3

    Store the preservative. Once the solution has cooled, store in a gallon jug until ready for use.

  4. 4

    Spray the solution. What you've cooked and stored in the gallon jug is concentrated. Dilute with equal amounts water and apply to the outer log surfaces of a log home or your wooden deck to repel burrowing insects. Apply in the spring and fall for maximum protection.

Tips and warnings

  • Do not use candles or candle stubs for paraffin --- the wax dye and burnt wick will transfer colour to your wooden furniture.
  • You must use environmentally friendly antifreeze (propylene glycol), not regular antifreeze (ethylene glycol) --- ethylene glycol fumes are fatal.

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