How to Use Fiberglass Drywall Tape

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Fiberglass drywall tape is used for covering the joints between drywall panels. The major benefit of fiberglass drywall tape is how easy it is to install. Because it is self-adhesive, fiberglass drywall tape doesn't need to be embedded in a layer of joint compound, as paper drywall tape does. But fiberglass drywall tape is more prone to cracking than paper drywall tape, so use setting-type joint compound to create a stronger surface.

Things You'll Need

  • Utility knife
  • Setting-type joint compound
  • 12-inch drywall knife
  • 100-grit sandpaper
  • Lay a section of fiberglass drywall tape over the entire length of the joint.

  • Press it onto the joint, making sure to keep it centered.

  • Cut away any loose strands or excess fiberglass tape with a utility knife. The tape should lay as flat as possible.

  • Cover the entire length of the fiberglass drywall tape with a coat of setting-type joint compound, applied with a 12-inch drywall knife. Feather the edges and leave the surface as smooth as possible.

  • Allow the joint compound to dry according to the product directions.

  • Sand the dried joint with 100-grit sandpaper. Apply another coat of compound to the joint if the surface is still not smooth. Let the compound dry, then sand it.

Tips & Warnings

  • Avoid using fiberglass drywall tape for interior angles. It will not form a sharp corner and may eventually crack.

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