Here are some of the bits of overspray that I removed from the receiver. Some of it fell right off, and most of it was easily removed using a nylon brush (similar to a toothbrush). More stubborn deposits came loose when caressed by a matching bronze brush. In the end, I had quite a bit of the stuff lying around my work area.
I was pleased to note that while it didn't adhere to the unprepared surfaces of the receiver, the Perma Fin did stick very well to the prepared surfaces.