How to Prevent Varathane Bubbles

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Few things are more disheartening than finding bubbles in the Varathane finish on a carefully crafted woodworking project, or bubbles in any polyurethane product, for that matter. Some people blame bubbles on the surface preparation of the project while others blame them on contaminants in the Varathane itself. Normally, neither of these reasons could be farther from the truth. Preventing bubbles in Varathane is easy if the user carefully follows instructions.

Things You'll Need

  • Stir stick
  • High-quality natural bristle brush
  • Read the instructions on the can of polyurethane. Open the can.

  • Mix the Varathane with a stir stick. Do not shake the can. Shaking is a cause of bubbles in Varathane or any other polyurethane.

  • Prepare the surface of the wood properly. Apply the Varathane using either a good-quality natural bristle brush or applicator. Do not spray the Varathane onto the surface. Spraying any polyurethane causes bubbles.

Tips & Warnings

  • Follow the directions on the Varathane can for instructions on preparing and staining a wood surface. Improper preparation can cause bubbling.
  • Use polyurethane products in a well-ventilated area, or wear a ventilator to prevent being overcome by fumes.
  • Never use polyurethane products near an open flame

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