My limited experience along with Dr. Gaddy's recommendation was that a 15 parts etch solution/ 85 parts water solution is what you want. Given the extremely short working time of the 15/85 solution, I'd even go weaker like 10/90 and get the dwell time in the solution up to something more reasonable like 15-30 seconds.

Last edited by Chuck H; 03/05/08 10:31 AM.