Mike,
You also might want to try using the R&R operation with the add time to paint, instead of the paint time with OLH.
Often you'll find the time comes out to be about the same amount. For example, look at a W-body and compare what you'd get paid for A0018 to using B0048. The trick is, the body shop thinks they got extra time for the R&R, and you've avoided spending extra money and using OLH.
About the question of taping/masking vs. detrimming in general, I agree with body shops that masking is not a proper way to do the repair, however your body shop's standards and GM's are two different things.
One thing I look for, and that I ask body shops to mention, is that the affected area included near the trims edge. For example, if the paint is peeling and that extends down into the trim, then I would suggest that removing the trim is necessary just to perform the repair.
While on this subject ... and this is for everyone ... Does STG's publication (GM-P0001-B) titled "Paint Condition Identification" still exist? Can dealers still order it? I have the book and the flip cards (GM-P0002-P) and they have literally been my paint warranty bible for five years.
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** Rob, Editor WD&S **Help is only a message post away!
robc@dealersedge.com