Yeah I repaired a plenty. I had a body shop for years then 2008 hit and I got cautious and took a railroad job just in case it was gonna get bad. Not really much difference in plastic vs metal. Only real difference is, even from factory, 99 out of 100 plastic bumpers or spoilers wont be a 100 percent match in color if whole panel is sprayed. Never have gotten a good reason of why other than surface smoothness of plastic vs metal. Still never added up to me tho. I dont see your scratches being a big job tho. Just the one. The others will buff out. Just dont buff them out then get someone to fix the bad one. They will not be very happy with u cause all the polish and compound will cause fisheyes when painted. No fun at all.