Originally Posted By: qwertydude
If it's dusting like mad you need to adjust your technique. You might be using too much, working too big a section, and working it too long. And some light dusting is actually a built in feature. Dusting is the polish's way to let it easily come off the pad. Too oily a polish ends up gumming up your pad which necessitates a pad cleaning which would slow down productivity. Hence why M105 which was originally designed for production purposes also dusts.
So with D151 when you're finished with a section you can blow out, brush, or spur the spent polish of the pad and start a new section right away. Oily polishes for me always end up clogging pads and needing a cleaning between sections or requiring multiple pads and changes. I actually dislike M101 for this reason.
As for getting only one pass, that's sorta the point of SMAT. Do one pass check progress, reapply and do another pass if necessary. Even you'll say it cuts fast and that's the point. SMAT wasn't meant to be worked and worked. Overwork it and yes you will get more dusting and you'll also get an unsatisfactory finish. If you work it til it's way past dusting the spent paint ends up sticking the SMAT abrasives together causing a less than satisfactory result, hazing or marring.
With SMAT abrasives you really have to get out of the mindset that working and working the polish will get you good results, it won't. You get the final finish on the first pass, if defects aren't corrected by then, reload polish and go for another. Maybe after three separate passes and you've still not corrected it, with D151 if 3 passes won't correct it, go with a more aggressive pad or it might be time to bring out the big guns like M105. But in my experience short of paint that's been rubbed with beach sand and gravel, D151 will take care of it.
Couple things:
1) Every person has a different arm speed. Slower is better, but it's hard to advise on an ideal arm speed without being there in person to demonstrate. Ultimately, what matters is the amount of time that is spent working the product.
2) Refer to the back label on a bottle of M205. No where does it say (or on any Meguiars SMAT products) to only use 1 pass. FYI, it says 2-3 passes at moderate pressure and 2 additional passes with light pressure.
http://archive.meguiarsonline.com/forums/photopost/data/809/M205BackLabel.jpg
3) A longer work time by itself, does not destroy the finish unless you are dry buffing. A more common issue is the paint residue that builds up. In situations where there's a lot of oxidation or embedded contaminants, it may be best to do 1-2 passes and blow out the pad...before continuing.
4) There's nothing wrong with oily products that do not dust. As long as you blow out your pad after each section (or more often), and get a NEW (or freshly washed) pad every other panel or so, you will be fine. It is important to remember that blowing out the pad is NOT sufficient – you can only run them for so long before they need an actual wash.
5) Many SMAT products recommend priming with a detailer spray. I usually just use a damp pad. Failure to follow this instruction when it applies, may sometimes result in a dust storm.
