Re: another everlasting debate (body work)
Terry, things have changed, and it is basically because of the cost of labor. We apply filler DTM (direct to metal) simply because we are taking steps to ensure the metal is clean, -AND the metal has been scratch-sanded where there is adhesion for the filler. You must remember that the collector-vehicle market for PPG is very small comparatively speaking, and most reps just do not have enough experience in this area to give prudent advice.
As stated above, use a 24 grit Roloc scuffing pad first over the area you are wanting to fill, then you can be assured it has the ability to bond to the metal.
Now if you really want to scratch your head, imagine if I were to tell you that we have just about phased-out using sandpaper in our shop. We have been transitioning to a new product called AbraNet. We also have experimented with a new primer that is rolled on instead of sprayed. The high-build version is in development now, and we will try it as soon as it is released. As I mentioned above, the technology is changing much because labor is getting too expensive for redundant operations. Kinda like the farmers rarely plow any longer and no-till crop planting is the norm.
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