Hello Glynn,
I would strongly recommend cleaning the top plate with acetone if possible, while wearing gloves of course.
The gloves will keep the acetone off your hands, and the oil from your hands off the plate.
Some clear coats will tolerate oils, others will fish eye around the spot.
If you're going to paint or powder coat the panel with a solid color, I would just sand it with some 400 grit paper, then clean and call it good.
-PB