How to Apply Protectant on Outdoor Slate Tile
- 1). Sweep the outdoor slate tile with a soft-bristle broom to remove any loose dust, dirt and debris from the tile.
- 2). Fill a bucket with 1/2 cup of mild soap and 1/2 gallon of warm water. Stir the soap mixture with a mop. Wear latex gloves to keep your hands clean and dry.
- 3). Wring out excess moisture and mop the tile with the wet mop to remove any caked-on debris. Rewet the mop, wring it out and continue mopping the tile until it is clean. Let the slate tile air-dry. Dry any crevices with a large towel.
- 4). Fill a paint tray with a water-based polyurethane slate tile sealer. Wear a nose mask to keep the sealer’s fumes out of your lungs.
- 5). Use a paint roller with an extension rod to roll one thin coat of polyurethane sealer onto the slate tile. Use a paint brush to apply the sealer to areas the roller can’t reach.
- 6). Allow the first coat to dry completely, for at least two hours. Repeat Steps 4 and 5 to apply a second coat. Let the outdoor slate tile dry for 24 hours after applying the second coat before walking on the tile.
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