precaution when trimming your part ?

Do you take any particular precaution when you trim your part with your Dremel ? How do you protect the surface from scratches that may occur during the trimming ?

I've had this problem : the srface was nice after demolding. After triiming the part, I've jad the bad surprise of observing many scratches and holes in the surface. My assumption is that I made the scratches myself simply by holding the part with my hand (with gloves on) and handling it durng the process (maybe because of carbone dust ?).

Hence the question. I'm thinking about covering the surface with a plastic film hold by masking tape all around the part edges.

What do you think ?

thank you !!