Nope.. Seems to work pretty well.. Make sure you overlap your passes and vary the direction. For example, I'll do the 1st pass parallel with the long dimension of the part. I'll do the next pass at 45 degrees to the left, then the last at 45 degrees to the right.
Occasionally I'll see some lines and I just touch 'em up.
I've had parts that refuse to really brighten up unless the pass was done in a specific direction and only in that direction.
Watch your working pressure. Don't push too hard on that last step. Let the wheel and the compound do the work. Apply a little compound (a second or two) every few seconds (20-30) and it should work well.
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