Acetone

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before

 

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during
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after

 

concrete collage
you can see how much the acid stained color makes the porch stand out

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acetone with border over existing driveway
acetone with border over existing driveway
acetone with border over existing driveway
acetone with border over existing driveway
acetone and recoloring over an existing sidewalk
acetone and recoloring over an existing driveway