How to Seal a Garage Floor

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Sealing a concrete garage floor protects it from road salt, eliminates concrete dust, makes it easier to sweep and prevents stains. It's also a great primer if you want to paint the floor.

Things You'll Need

  • Concrete Sealer
  • Garden Hose And Nozzle
  • Large Paint Tray
  • Paintbrush
  • Stiff Brush And Bucket
  • Concrete Cleaner And Degreaser
  • Paint roller with long handle and medium-nap roller coverPainter's masking tape
  • Use a hose to scrub the floor with commercial concrete cleaner and degreaser according to the manufacturer's instructions.

  • In stained areas, let the cleaner soak in for up to 30 minutes, and repeat the application as needed for stubborn stains.

  • When the floor is dry, put the sealer in a large paint tray. Use a brush to cut in the perimeter and then roll the rest with a mediumnap paint roller, equipped with a long handle. Work your way out of the garage. Apply generously but roll out all puddles. Sealer will stain surfaces, so apply it carefully and mask other areas when spraying.

  • Clean up tools with warm soapy water immediately and allow the sealer to dry as directed by the manufacturer. Do not apply a second coat.

Tips & Warnings

  • Read product cautions and directions, ventilate the room, and wear protection such as goggles and a respirator mask.

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