I recently used Pool Patch on some step corners where the gunite had been ground away by the Polaris, strange but very true. All good, I'm pleased with the product but I purposely just 'lathered it on' as I wasn't sure it would work. What I have now is a surface that is far from flat. I was thinking of using a pumice block to file the area flat. Is there any other product that might work better? The area is a strip about 3ft long. Here is a pic of what was happening, though it grew in time. That area is now covered up with Pool Patch.