Just spit-balling here, but I think having at least some degree of dust is a natural and expected byproduct of compounding. All of those spent abrasives and removed paint have to go somewhere!
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First and foremost, I have to thank Alex for bringing me in on this job; it was truly a pleasure to work with another like-minded professional on two amazing automobiles such as these. Since you've...
I was rather astounded and confused when I saw Bob post on Autopia.org that Jeff would no longer be working with him on any future projects. At the time, I hadn't seen the thread on this forum.
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D300 has silicones in it (not body shop safe), and I've been able to uncover defects with IPA/Eraser after using it. Purely by nature that would seem to indicate it fills somewhat.
Are you fully licensed to perform mechanical repairs? Often there are stricter requirements for that and huge fines if your shop is not properly approved and/or you don't have a mechanic license/ASE...
Evidently you haven't done all of your homework. Search around, there is plenty of technical information and demonstrated proof of what we're talking about, here. (Note that much of it exists outside...
Comparing the MSDS for D111 and D114 should clear that up pretty quickly; the two have pretty much nothing in common ingredient-wise from what I can tell.