I'm building an MPC Millennium Falcon which I will light. I can tell there will be seams that are not big enough to fill with putty in the traditional sense, but light would show through. I know about painting the interior black, but what can I use to block out the seams? It really needs a bead of something all around, but this might take two tubes or more of modeling putty and I'd like something more economical. Any ideas?