Hi, Thanks for your help. My application is to do nanolithography on PMMA film. Do you have this kind of experience? Sincerely, Dazhong > you can prepare the PMMA solution in acetone firstly, and deposited on > glass slide by spin coater > Depends the thickness of the PMMA film that you want, you can change the > concentration of PMMA solution > Also , you can buy the commercial PMMA solution > Jian Shi