i spilled some of the refill ink in my garage and the stuff didnt come up ATALL we had it sandblasted,bleached, used acetone, even hrdcore concrete clener then powerwasher. its still there.
this sh*t smears like crazy in my experience messy as hell too!!its opaque though and smells like a mix between leather dye and woodstain and something else toxic and tasty nonetheless comes with a lot of ink totally worth the price. did anyone else think it was real oily????
as a re: review... the window chalk mops are sh*t, im like its the same thing so i stupidly bought 1... it tore mis way through a tag on a concrete wall...than it lookes like duece. nuff said.. AP reply. why are you using it on concrete? thats not what its meant for. Its for SOOTH SURFACES.