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Well, I've used the Porter 7424 (haven't use the Ultimate yet but should be similar) for last 3 years and have detailed about 30 cars so far and the buffer has never let me down. I like the fact that I can switch from one pad to another by peeling it off the velco. Here are some tips I've found that I hope you'll find useful:
1) I usually tape up all the plastic trim pieces with painters tape - good to stock up on tape of various width). Before using the pads every time, I spray the pads with Z8 (don't need a lot, just a couple squeeze). This will moisten the pads and let the wax spread easier
2) When applying liquid wax (e.g., Zaino Z2/Z5) to the pad, I usually do four corners of the pad plus center. Then I dab a few areas that I'm working on to spread the wax. Usually a square of 2ft by 2ft
3) On slow setting "1-2" I start to spread the wax evenly and thinnly across the area. Don't apply too much downward pressure and let the weight of the machine do it's work. BTW, I don't like mounting the side handle as I find it too restrictive and can hit side mirrors and panels. Repeat for the rest of the car.
4) Once finished, I immediately wash the pads to get rid of residual wax (work the cleaner into the pads and squeeze). I found an easy way to dry the pad is to reattach the pads onto the buffer and crank up the speed to max and let it spin dry. Remember to do this AWAY from the car and wear eye protection!!
That's for applying wax...
For polishing, you pretty much do the same thing except you should be working in smaller area 1ft x 1ft at one time and start with slow speed to spread the polishing compound and turn up the speed to actually perform the polishing. And make sure you use the right pad...when polishing, always start will least abrasive compound and work your way up if you still see the scratches (never take any short cuts!!)
I find polishing compound is great for removing scuff marks from side mirrors/bumpers,etc. as they usually on top of the clear coat and easy to take out.
Good luck!
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