We are updating the MAC 2000 Profile and Performance gobo material specifications to include both stainless steel and aluminum. Though glass gobos are generally the most durable, satisfactory results can be obtained in many applications at less expense with aluminum and stainless steel gobos.
Our experience with the MAC 2000 Performance, which is supplied with aluminum gobos, shows that aluminum can hold up to the heat very well.
Custom stainless steel gobos, however, can warp, losing sharpness, in a matter of hours in the MAC 2000. The useful life will depend on the gobo pattern and the projection cycle. Consult your gobo supplier for more information.
For correct projection, install custom gobos with the true image facing the lamp. The false-image side (which faces away from the lamp) should be coated with a suitable high-temperature black paint to reduce reflections.