CompuServe Messages

I created a metal material which requires 2 texture maps. On one particular object, the turret, I want to Decal a Red Star on it. So far the only solution is to replace the second texture maps ( which puts my rust spots on it) with the redstar Cel which is decal. Could anyone give me any ideas how I can put that Red Star Decal on, and still have my 2 texture maps? Judy