I just looked at my deck after 3 mowings..........after 3- brushed-on applications of EZ slide and 72 hours of cure. It's gone! The deck is clean down to the paint ( no grass build up ) but I didn't expect much because my deck stays pretty clean anyway. I wanted to try the EZ Slide on my new Simplicity deck as I had a 1/2 can left over from my old John Deere deck ( which it didn't stick on very well either). I had tried some of the sprays in the past and NONE of them worked very well. It may help with easier cleaning of the deck for 1 or 2 mowings, but it won't last long. As said before......WET grass will increase the likelihood of build up under your deck. Air flow and sharp blades will be the best deterrent to a build up issue. That being said, there is no harm in coating the deck if it helps the clean-up process.