I haven't run into that problem yet, but I'd probably use green stuff for that: http://www.games-workshop...0007a&prodId=prod1095494

I'm sure there are other vendors as well.

Molds owned: 85, 88, 204, 265, 266, 267, 268, 276, 277, 278, 279, 280, 285, 295, 302, 325, 326