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When It Rains Before Your Concrete Sealer Cures

We’ve all been there. The forecast shows sunny and 80 degrees, but at 3 in the afternoon the clouds roll in and it starts to downpour! If you’ve recently applied a concrete sealer, you may run into a few issues if less than 24 hours has passed before it rained. Here’s what to do if it rains before your concrete has had a chance to cure:

Silicate Sealers – Silicate sealers can take up to 90 days to fully react below the surface, but the initial chemical reaction happens within the first 72 hours. If you apply the sealer and it rains within 24 hours, the unreacted material below the surface can be diluted by the rain. Unfortunately, there aren’t many immediate signs that will indicate whether or not the sealer was affected. In this case, you can simply apply another coat, or wait a couple of weeks and determine if another coat is needed.

Silane-Siloxane Sealers – Silane-Siloxane sealers dry pretty quickly, but they continue to react below the surface. Like with silicates, water can dilute the unreacted sealer and there aren’t many immediate signs that will indicate whether or not the sealer was affected. In this case, you can simply apply another coat, or wait a couple of weeks and determine if another coat is needed. Something to consider if you applied a water-based acrylic: if the water-based acrylic wasn’t impacted by the rain, it will bead the water-based sealer if you put more sealer down. If you are considering re-applying a water-based silane-siloxane sealer after it rains, ensure the substrate can absorb water and that the new sealer won’t bead.

Acrylic Sealers – Acrylic sealers are a bit more sensitive when it comes to rain. Water and acrylics aren’t a good combination. If it rains and the acrylic hasn’t had a chance to cure, it will delaminate, and you will end up with white blushing and hazing throughout the sealed area. If you used a water-based acrylic, the delaminated coating would have to be removed using a coating remover like the Armor CR100, and then re-applied. If you used a solvent based acrylic, the solution is pretty simple. You want to let the coating cure at least 24 hours, then apply the Armor Blush Repair to the surface. The Armor Blush Repair will re-emulsify the acrylic and allow it to properly recure.

If you are unsure what to do, don’t hesitate to contact the manufacturer of the sealer or coating you used and they should be able to provide you with advice on what to do next.

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