How to scribe something more putty than plastic?

Thanks for the ideas. Ryan, you are right… it does not scribe well. A test patch showed due to relative softness it is hard top not gouge a line instead of scribe. I am building Yellow 6, which is said to have been on the assembly line with a small group of aircraft that had the larger wood tail as the only modification so the rest of the airframe should be OK as is.
http://hem.passagen.se/galland/kg27.html

The supporting structure is a styrene spine with styrene strips filling and sanded to a basic shape, with coats of Tamiya putty and looks good so far.

Thom, I you are right about CA so I will try “painting” the putty with CA to see if it will harden the surface enough for a better scribe line.

I wouldn't try to structurally construct anything with putty. Styrene is a suitable material, but the Ta 152 vertical stabilizer is something that I would not take on. Mow a few lawns, and get the money for the AM tail.

Steve

Try using a two component epoxy putty like Milliput. This will dry rock hard (when properly mixed) and can be scribed.

Could you rebuild the tail using styrene and CA. Harden CA will scribe better than putty but takes a bit of effort.

Cheers,
Thom

Tamiya putty and most other putties don't scribe well at all. I would recommend buying the AM Ta 152 tail. I think there were more differences than the tail. The whole plane was longer(nose and tail) with a different engine.