I used 2 1/2 on a walkway and hit up the side of the house about a foot high with same mix and let it set. The color was peach and unfortunately it turned yellow-green. I’ve seen this color before and gone heavy on it without any problems but this one turned. I offered to repaint but they said don’t worry about it.
This is exactly why anything painted or stained I always do a pretest in a inconspicuous spot with a 1 percent housewash mix.
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Painted I use straight 12.5 out of my pump sprayer. I want a huge margin of error, lol.
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He means for the test spot BTW 
Sherwin Williams are huge jerks…
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could this happen to non organic paint if it’s just been painted?
