Dear All: I plan to coat Cr and Au on silicon and than put it in conc.HF for 30min, now I find some problem. now I plan to coat layer of polyimide on Au before HF as a protecting layer 1. the adhension of polyimide to Au is good enough? 2. if the polymide is fully cured, can I get rid of it by oxygen plasm? Thanks in advance! Lili --------------------------------- Do you Yahoo!? Yahoo! Search - Find what youre looking for faster.