This post was most recently updated on January 26th, 2022
Tips To Fix Concrete Sealer Bubbles
We often hear about the appearance of pesky bubbles that appear in finished concrete sealer projects. In this updated article, we explain how to avoid concrete sealer bubbles, and if they appear, how to fix them. If you have encountered concrete sealer bubbles and have any suggestions or have any questions, please comment below.
Solvent-based Acrylic Concrete Sealers are designed to enhance, darken, and give a sheen to decorative concrete surfaces. Unfortunately, when applied incorrectly or overapplied you may have issues with “bubbles” forming in the sealer. This typically happens to Stamped Concrete or smooth decorative concrete surfaces.
When a solvent-based acrylic sealer is applied, some of the sealer penetrates into the porous concrete. If the application is too thick, or if too many coatings are applied, the solvent is not able to evaporate before the sealer dries. When that happens, the solvent gets trapped and eventually creates enough pressure that it forces its way out, creating bubbles.
Tips For Applying a Solvent Acrylic Sealer:
- Follow the manufacturer’s directions on the proper spread rate
- Do not over-apply. Adding too much sealer is not better and may create issues
- Concrete porosity differs. The more porous the concrete is, the more sealer can be applied
- If applying more than 1 coat, allow the coatings to dry thoroughly between applications
So what to do if you get the sealer “bubbles? Here are some steps to take to try and remedy the situation.
- Sweep or blow off the dirt and grime
- Wait until there is not any direct sunlight. Usually late in the day is best.
- Applying a solvent to reset the sealer and “melt” the bubbles.
- Let the sealer sit overnight and dry properly
Note: The bubbles may still come back. In many cases, the above steps will fix the issue. If this does not fix the bubbles from reforming, you will need to strip off all of the sealer and start over.