SeaScapes

Yes just spray it on and allow time to dry. We use pump up sprayers for this all the time. You must be sure to keep everyone off it while the chems react. Last year we did a driveway and the home owner let his dog out and the dog ran across the driveway. Didn't hurt the drive to bad but it did sealer all over the dogs paws. If a person were to walk across it then the shoe prints would be in the sealer and would want to lift it off at the same time.

Did this roof yesterday...

I thought it was algae but boy did it take some chemical and some work. If it wasn't slippery feeling to the touch I would have thought it was stained. But due to the fact that it was slick I am also led to believe that it was some form of algae.

Question I have for you guys is...what was that on the roof? It was black and purple'ish. Any ideas? Thanks

This is the rest of the pics.