Just checking in to make sure that I didn’t mess this concrete up. It’s underneath an outdoor pavilion and I found a stamp indicating it was poured in April 2018. It still has a pretty nice cream layer and out of an abundance of caution I changed the tips on my SC just to be safe. I never noticed and milky white or gray discharge.
There are bands of brush marks that are about 2 feet wide running in each direction. When wet these were a grayish color. When dry they are more of a sandy brown. They are obvious to me and you can see the alternating direction as you look at the concrete long ways. I did notice these bands in areas I hadn’t cleaned yet so I know they were there before.
Below is an after shot that isn’t all that great. I’m just hoping one of you experts can confirm this is something in the concrete that I didn’t cause, but exposed by cleaning it.
Aside from the brush marks, the pavilion looks really good.