Dear Kevin, according to your reply you seemed to be able to use SU8 as a mask with KOH, as it seems that nobody could do that experiencing lift-off (and maybe very limited etching) it would be very nice if you could share some details that could be added to http://aveclafaux.freeservers.com/su-8.html#top for everyone's benefit! Thank you in advance! FranCk _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail