How to Glue/Attach Wood to Plastic (Polyethylene and Polypropylene) With 100% Silicone Caulk

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100% silicone caulk makes an excellent glue/adhesive when attaching wood to plastic like polyethylene/polypropelene. Given that construction adhesives cannot grab onto hard plastics since plastics are non-reactive, 100% silicone caulk is an excellent alternative.

Parts:

  • 100% Silicone caulk (be sure it is not acrylic)
  • Caulking gun
  • Wood (using cedar wood shims here)
  • Hard plastic like a trash bin
  • Heavy duty cutters or snips

Supplies:

Step 1: Preparation

  1. Use the heavy duty cutters/snips to cut open the silicone caulk spout.
  2. Use the puncture tool on the caulking gun to puncture the inner seal at the bottom of the spout.
  3. Load the silicone caulk into the caulking gun.
  4. Open the cedar wood shims and test place where you want the shims to go on the hard plastic

Step 2: Apply Silicone Caulk and Attach

  1. Using the caulking gun, put silicone caulk onto the wood shim in a rough "S" pattern.
  2. Use a wood paint stirrer or your finger to smooth it out.

Step 3: Place Wood on Plastic

  1. Place wood on plastic
  2. Press firmly into place
  3. Repeat steps with additional pieces of wood
  4. Give the silicone caulk about 24 hours to cure.

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    4 Discussions

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    tytower

    2 months ago

    I don't think that will stay attached very long . You have 3 different materials all with different rates of expansion and contraction and you didn't even clean the plastic first?

    3 replies
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    matt392tytower

    Reply 2 months ago

    This technique was used to attach wood to the bottom of a plastic trash bin to repair a large crack. So far, it has lasted a NYC winter and NYC Sanitation workers handling of the bin.

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    matt392matt392

    Reply 2 months ago

    Also, a business colleague of mine has used this technique to attach letters to the outside of a pizzeria in Brooklyn, NYC. He reported that they stayed attached for years.

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    matt392matt392

    Reply 2 months ago

    Silicone caulk not only has very strong adhesive properties, but it is also quite flexible.