Proper surface preparation is one of the most important factors in achieving long-lasting sealer performance, and that includes verifying the alkalinity of the concrete.

New concrete naturally has elevated alkalinity that decreases over time, while grinding, shot blasting, and scarifying expose fresh concrete that is often higher in pH. Acid washing can also affect the substrate by lowering the pH too much or leaving residual acid behind if not properly neutralized. Because these preparation methods can significantly change the concrete surface, testing the substrate before sealing is an important final step.

The Durável pH Test Kit for Concrete makes it easy to verify that prepared concrete falls within the recommended pH range of 8.5 to 10 before applying water-based acrylic concrete sealers. The kit includes a 4 oz bottle of distilled water, a pH test pencil, and a color comparison chart that provides fast, easy-to-read results on the jobsite.

Whether you’re sealing decorative concrete, patios, driveways, walkways, garage floors, pool decks, or commercial concrete surfaces, confirming the proper substrate pH helps create the best conditions for successful sealer application and long-term performance.