I’ve created a head with eyes.
One matcup for eyes and one for the skin of the head. Then i
created a texture for eyes. I fill with Color and Material my eyes, and then
choose texture. After that when i change my material, material of my eyes change too !! Is there any way to use several matcups with textures or
this only post work for Photoshop ? 
you should be able to apply multiple materials. unless you’re using FLAT COLOR. That one will remove every other color.
Can you show some images of your process and the problem?
ye, ofcourse.
Some pic. below.
1)
Attachments
i’ve had similar problems, i think this thread is related:
http://www.zbrushcentral.com/showthread.php?t=78792
That eye is an old ZB2 Tool, that you found here on the Forum, right?
I recently used it on one of my characters and i had the same problem. The material just wouldn’t stick. So i quickly did a retopo and all was good again 