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I just got a panel scriber from Micro-Mark and need some tips on achieving straight lines on curved surfaces. I am building a '70 Pontiac station wagon by using the styrene front clip from the '70 Pontiac Bonneville/speedboat kit from Model King and a '65 resin Pontiac sta. wagon body from R&R resin. I have made the saw cuts and epoxied these two parts together (the match came out perfect!) and am now removing and adding features on the body to replicate a '70 model year. One of the problems I encountered on the resin body was that the door panel lines are not very well defined. I have practiced using the scriber on flat syrene sheet stock and with a steel straight edge as a guide it is no problem getting a good scribed line. I tried scribing on the curved surface of a scrap styrene body and can't get a good straight line without a guide. I tried using various masking tapes but the scriber would actually lift or move the tape edge.....no good. I fooled around with a scrap resin body also and noticed it is even more difficult as the tool really seems to "wander". Is resin more difficult because of some inconsistency in the material after curing? Any help is greatly appreciated..