Is there a trick to scribing Tamiya putty?

Super sharpness!  I use my scalpel for this (and for canopy masking( rather than X-acto knife).

Hi,

I'm not real familiar with Tamya Putty, but for stuff that can be a bit brittle when dry (like Squadron Putty) I have tried coating the area with either sanding sealer or airplane dope, and letting that dry, prior to trying to do any sanding, or scribing.

Pat

Gentle, slow, repeated passes until you get the line you wish.