Coming back together nicely Andy. After my Squadron Putty had hardened in the tube with more than half a tube left and the Canadian dollar was in the tank, I bought a tube of Bondo Spot Putty. Several years later, I haven't noticed any shrinkage. If there is a down-side, it has to be applied in thin layers or it takes forever to set up. It works well with your preferred non-sanding method and despite being a dark red, paint covers it well.
Geo