Staff Answer
Aug 03, 2026 - 02:28 PM
Our GBS Micro-Etch is generally used for opening the pores of concrete before applying our penetrating sealer. A normal screed finish usually does not require etching as it is already porous. Etching is only required if the concrete is power-troweled or polished and the concrete is so dense that our water-based sealer won't penetrate. Ask your contractor if you don't already know how the concrete was prepared.
One way to test the porosity is to dip your fingers into a glass of water and spritz water droplets in several areas. Then watch to see how long it takes for the water to adsorb. If it's porous, it will adsorb in a few minutes and turn dark. If not, it will bead up and sit on the surface for hours. That's how you know the concrete is too dense and needs to be etched.
Aside from chemical etching, you can also mechanically etch the surface with a grinding machine. These can be rented at most rental stores. The goal is to open the pores to allow stains or sealers to penetrate easily.
If you have further questions, please contact an Eco-Advisor at 641-472-1700 M-F 9-5PM CST.
One way to test the porosity is to dip your fingers into a glass of water and spritz water droplets in several areas. Then watch to see how long it takes for the water to adsorb. If it's porous, it will adsorb in a few minutes and turn dark. If not, it will bead up and sit on the surface for hours. That's how you know the concrete is too dense and needs to be etched.
Aside from chemical etching, you can also mechanically etch the surface with a grinding machine. These can be rented at most rental stores. The goal is to open the pores to allow stains or sealers to penetrate easily.
If you have further questions, please contact an Eco-Advisor at 641-472-1700 M-F 9-5PM CST.
