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The Turtle Wax spray is great, I did 1 coat 3 months ago and water still beads like day 1. Paint is still flawless, even the front bumper after a few thousand miles.
I too have used a lot of different products. Just this year I came across P&S’s Bead Maker. After using it for a month, I threw away all the various sprays and detailers I had in the garage. Replaced them with the P&S Line.
I use the bead maker as a drying agent after every wash. The slickness and depth is amazing.
My M3 now has 7500 miles and the Suburban has 25,000 miles.