We used a roller to spread the thick product on a large light color paver driveway. After 15 minutes, we used a power washer to easily lift the black spray paint up & wash away the chemical. Depending on how thick you apply the product, it may not cover as much surface as noted on the container. Plan accordingly.I got this product to try and remove the last vestiges of some week-old spray-paint/permanent marker graffiti at the rest area where I work, after trying other homemade treatments. A single application of this product with a dwell time of ~30 minutes (I'm impatient, and want to re-open the bathrooms as soon as possible) removed almost all of the remaining paint and faded the marker by about 80-85%, making it hard to see without close inspection. Given the fact that this wasn't fresh graffiti and the grout hadn't been treated/sealed in any way, it was remarkably effective and will become a staple in the future.The one downside is the consistency of the product itself, which slows down the application somewhat. It has the texture of snot/mucus, and is a bit stringy, meaning that it's hard to spread smoothly or apply precisely to small areas.Took the graffiti right off the brick wall without having to scrub. I would tell anyone this is the number one remover, no doubt!Did not remove spray paintWorks great as stated!After sandblasting and using other graffiti removers...my technicians were ready to rip their hair out. Nothing was removing this spray paint. I ordered this remover due to the fact that the graffiti was on decorative stone. This product does exactly what it advertises! We couldn't have been more pleased with the outcome. After letting the first coat sit for 30 minutes and pressure washing it off the stone 80% of the graffiti was gone. The spray paint that was left behind was embedded in the nooks and cranny's of the stone and just needed an additional coat of remover and a scrub brush to remove it. A little also goes a long way. Overall extremely happy with this purchase and will definitely purchase more in the future.Very happy with the results. It removed one year old graffiti that was on this brick wall. I applied it with a normal long paint brush and it let it sit for 5 minutes while i was getting my power washer set up. It did the trick. The results speak for itselfEdit Update: 9/12/2021Once again our wall got hit and finally got pictures of it. I applied and let it sit for 10-15 minutes. I went to go grab the water hose and as long as it took me to set up my hose and gun spray jet. The formula was doing its job. Once I start spraying the graffiti was dissolving as I spray throughly. Take you time and the results are amazing.Product did the job, took about 3-applications and 3-power washing but it did the job