Sunday, August 4, 2013

Why does my sealer blush out when it rains on it and then dry back clear?

Ask a Pro
Hi Earl,
Hope you are well. I watched all the videos, asked you a ton of questions and ordered the artist grade interior stain kit. My project involved smooth concrete on a porch covered by an awning. On the website I did not see a specific difference between the products for interior and exterior projects. I have stained the porch with Riverstone, neutralized thoroughly and put on my first coat of sealer. We have had tons of rain so I am waiting for the opportunity to put down the second coat of sealer. The first coat of sealer is more shiny than expected but not bad-the Riverstone color is perfect! I was very careful to put down a thin coat of the sealer.
The sealer dried for a couple of days before the next rainstorm. The awning is not up now (but will be soon) and when it rained the porch got very wet. I noticed some small pooling and where the rain pooled, it looked like fresh sealer, kind of blue and milky white. I left the areas alone and the rain dried and everything looks fine. Is this normal? Does this mean the sealer is not completely dry yet? It provided a great surface, not slick and it isn't sticky-maybe the humidity could be affecting it? It will be at least a week before I am able to put on the second coat of sealer...
Along with the interior kit I received the wax which I ordered in a matte finish. In an earlier response you suggested waxing the porch since it is covered. How long should I wait to wax after applying the second coat of sealer?
I am very pleased with the Concrete Camouflage product line and my porch looks great! Just want to make sure I am doing everything correctly.
Thanks for your time (again!),
What you're seeing is the moisture wicking through the sealer and exiting. The Clear Shield Advanced sealer is designed to let the concrete breathe and allows moisture in the concrete to come through so it can exit and doesn't keep the moisture trapped underneath, like other sealers do. If the moisture that wicks up through the concrete can't escape then the sealer looses it's bond and eventually begins to peel. So this is a good thing.
Anyway, when you apply Clear Shield Advanced sealer, any areas of the concrete that has excess moisture in it still, or if the sealer gets wet before it cures out completely, will cause a blushing effect when the sealer gets saturated wet but then dries back clear once it dries completely out, as you're seeing. The good news is that this will only happen for three or four wet/dry times and then it won't do it any longer. So it's nothing to worry about.
You should allow the sealer to cure out for a couple of days before applying the wax.
I hope this helps,