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I think I used to expose the photoresist for about 5 minutes under the sunlamp. I used glass to hold down my negative on the board. Has been a while since I have done that though.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Sunday, August 21, 2016 7:25 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Re: First Negative developement Brd
Thank you to all that replied to my questions. There seem to be a lot of differences in the amount of time board is under light. From one minute up to eight or more minutes.
A test to the light system to determine how much time is in the works today. I have foam
brushes to eliminate the rocking I was never happy with with etchant.