How long are you guys leaving this stuff on? I have the DP MW and when I did the front end of my truck the other day, i left it on for about 30 mins to "cure". seems as if I lost some of the depth from using the Optimum compound followed by polish. Did I leave this stuff on too long? should I have used my Poorboy's EX w/carnauba to seal, then top with the DP? How are you doing it?