Three months ago or so I got a Porter Cable 7424. I'm just a weekend wash/wax/detailer old guy. I put Klasse AIO on my taupe colored '02 conversion van after a good thorough wash. First time with the polisher, and other than a tendency to use more polish than I should, everything went great. Then on top of the Klasse, I put on Blackfire Wet Diamond. This van lives indoors, even at work, but still, it is slippery to the touch, even when a little dirty! So the other day I drove 200 miles one way in a downpour, turned around, and drove another 200 miles in same downpour. I figured that given the number of months since application, and the harder than heck rainfall, that the West Diamond would probably be shot, and the vehicle would no longer be slippery or show sings of a good wax job. I went to close the door yesterday, and my hand slipped right off yet again. I couldn't believe it, and checked other areas of the van, and 95% was still slippery. Not as good as the day it was applied, but still very impressive. I will be putting another coat on soon, even though it doesn't NEED it, just because I know it is truly great stuff!!! Tremendous!