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So have I messed up by double popping? Or do you think I will be fine. Was it a waste of time?
No, I don't think so. I've used that technique a few times for certain floors.
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Will a marron buff pad take any remaining raised grain off to give me a nice smooth finish when I buff between coats?
Try to find 3M's SPP maroon pads. There is a difference. The SPP pads are coarser and knock down the finish better and last longer. A fine screen may work better on a square buff as those buffers are not nearly as aggressive as a circular buffer.