We have a concrete patio slab under a huge old oak tree.
With all the shade, when it rains, the patio dries slowing,
and the white concrete is now a dingy dark color from the yuck on it.
I can power wash it - but it comes back next year.
Wondering what I can use as a sealant to help prevent the dark dingy micro
Most of the online blogs don't like the big box concrete & deck sealers.
I don't want the patio to become slick when wet because it has been painted
with a sealer...
The solvent based concrete sealers are the most
effective products. But two problems. One is that
like all sealers they will tend to leave the surface slick.
You can mix in some fine sand to eliminate that.
The other is that you can't buy them in many states
because of the EPA. If you live in one of those states
you may be able to find someone who will ship it.
Kure N Seal 30 is the one I use.
You don't say where you live, but in my neck of the woods the black yuck is
soot from the air, I suspect deposited from automobile particulate
Further evidence comes from my concrete driveway getting yucky without water
standing on it.
That said, a sealer would probably be a good bet in that it closes up the
near-microscopic pores into which this pollution lodges.
What sealer, I don't know.
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