Thread: Discussion PCB etching problem
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Old Jan 27, 2006, 08:49 AM
Graham Stabler is offline
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Sticky Shepherd
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Oxford/England
Joined May 2001
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try it cold, perhaps the heat is affecting the sharpie and toner. Fundementally acid must be getting past the mask. Bear in mind that the holes in the mask may be much smaller than the pits seen in the board because the acid will undercut the toner.

Cleaning the board well before adding the toner will help a lot with the etching time and toner adhesion and another thing to check is that you are not leaving clay from the paper between the toner on the board after ironing. I rather like Bob Baileys technique of using PTFE plumbing tape as it avoids that problem.

Graham
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