Answer
Jun 19, 2021 - 08:27 AM
The best product for sealing concrete and preventing hydrostatic pressure from pushing moisture upwards is our GBS Penetrating Concrete Sealer. Like all sealers it requires a clean, dry, porous surface that has not been previously sealed. If your concrete is absorbing water after a lot of rain and it's showing up on the surface, then it's probably not sealed. You can also test this by dipping your fingers into a glass of water and spritzing the surface of the concrete and watch what happens to the water droplets. If they stay on the surface for 5 min or more, then the concrete has most likely been sealed. Concrete can also be power-troweled which can make the concrete very dense and non-porous. The same test will help you determine this. In either case, if the concrete has been sealed or power-troweled, the concrete will need to be acid etched or ground down mechanically to open the pores.However, don't confuse this with condensation. Condensation occurs when moist humid warm air comes in contact with a cold slab. This is just like the moisture that beads up on the outside of a glass of cold lemonade on a hot day. This will occur on both sealed and unsealed concrete. Concrete sealers will not help prevent condensation. You need to purchase a dehumidifier to help reduce the moisture in the air.
