No problem with plastic ones.

Some people complain that plastic spinners tend to score easily due to the starter.

I found that if this happens, you are merely using the wrong starter cone, or the wrong starter cone material.

After changing my starter cones out fo a softer silicon cone ( and keeping them clean! ) I have yet to even mar the shine on plastic spinners, up through 3.25" in size on engines as big as 1.80 four strokers.