I'm thinking that you're talking about rough edges on the back of the emblems? If so, you can take a die-grinder or a dremel and grind off the rough edges, then polish it to a smoother finish. Its time consuming but they won't "cut" into the new paint. You could find some very thin foam tape about a 1/16" thick having one side sticky, then stick it to the back of the emblems and trim off the excess being careful that you dont have any sticking out ones the emblem is back onto the car. You could also do the same with very thin 2 sided tape like they do on newer cars but it will also stick to the car if you ever wanted to remove them at a later time. I hope this gives you some ideas to play with.