How to Seal Concrete Walls With Siloxane

Concrete is a durable product that, when properly cared for, will last through the harshest winters and most oppressive summers. The structure of concrete is affected by the natural expansion and contraction of liquids. This process creates cracks and crevices in unsealed concrete, leading to damage that is potentially costly to repair. Sealing your concrete walls with siloxane, a silicone-based chemical that seeps into and fills the concrete’s pores, protects them against wind, water and sun’s damage.

Pressure washer
Oxalic acid rust remover
Paint roller

Instructions

- 1
  Allow newly poured concrete to dry for at least 30 days before cleaning the walls or applying a siloxane sealant. If you are sealing an existing concrete wall, move on to the next step.
- 2
  Clean the concrete walls with a pressure washer. The washer removes any dirt, debris, moss and mildew from the wall without causing damage. Remove any rust stains from the surface with a cleaner that contains oxalic acid, according to the package directions.
- 3
  Allow the concrete walls to dry for at least 24 hours.
- 4
  Apply a light coating of the siloxane sealant to the concrete wall with a paint roller. Use straight, back-and-forth strokes to create an even coat of the sealant. Siloxane sealant is a penetrating product and doesn’t create a sheen or glossy finish.
- 5
  Continue to apply thin layers of siloxane sealant until a white, milky finished is achieved. Allow the wall to dry for at least 24 hours.

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