Buffer trails are usually caused by a dirty pad, high rpm with the rotary, an agressive polish, and a dry pad-wool or foam. You can either tape off the edges or just pratice and lighten up on the rotary when coming to an edge or not keeping the rotary near an edge for very long. I would suggest practicing with wool first to just get a feel for the rotary and then move on to your foam pads. The wool is easier to control.
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