pressure washing damage to flagstone???
rings around stone perimeter
Hi, I have attached 3 pics, the first is of an area that looks OK with the sealer applied, the next 2 have the rings on the stone perimeter.
I think the rings are damage from where the mason was trying to presure wash some of the dirty joints clean before he sealed the patio, since all the rings are on the perimeter near where he was trying to clean the joints. In one pictures you can actually see the wand marks swirled around in the stone, from the pressure washer.
He doesnt think its stone damage from the pressure washer, and wants to come out with paint thinner and acetone to test some of those stones with rings on them that are darker. He thinks its because he pressure washer a previous layer of sealer off from around the joints, and then resealed the whole patio, instead of taking the previous layer of sealer off the whole patio and then resealing...
Does this look like pressure wash damage? Should I let this guy back onto my patio with these chemicals, or should I find someone else???
THanks,-- its an acrylic/water based sealer you roll on.