If a panel has the clear "blended" in a spot, in a year or so, a "hazy" line around the area usually appears.
This is due to the clear being "thinner" on those edges and the UV rays are breaking the clear down, since it is thinner and has insufficent UV blockers because of the lack of film build.
Ford`s Body and Paint Tech Center, in it`s manuals and TSB`s, do not recommend blending, only complete clearing of a complete panel to a break line.
There`s nothing wrong with Sherwin Williams materials, or BASF, the only real difference is the painters perference due to some unknown.
Then there is the issue of what the PBE supplier in the area pushes due having a better deal from one paint company over another.
I have used both, as well as several others and, when it`s all said and done are pretty much equal.
That said, BASF, DuPont, AzoNoble, PPG, Sherwin Williams, etc, for a total of around 10 paint brands, are tested and approved by a consortium of GM, Chrysler and Ford body/paint techs every couple of years.
The Big 3 then list these approved paint suppliers in their TSB`s, etc.
Grumpy
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