Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi, I recently bought the roller-coating version of this photo resist and am
having a terrible time getting a board to cure properly. What generally
happens is that the board will cure somewhat well except for a big, jagged
"rip" through the center of the board's resist. It looks like a ragged tear
in the resist and spreads out in sharp edges kind of resembling a lighting
strike with the streamers of the defect branching out. If anyone is
interested I can post a picture of the problem. Has anyone used this stuff
and had any success with it? I've tried diluting it since it tends to
capture bubbles like crazy when spread normally but that just results in a
pool of concentrated resist in the center of the board and decreasing
amounts as it reaches the edges of the board. I would really appreciate
some hints since the stuff has great potential to coat large/thick boards
that won't fit in a normal laminator with the dry film resist.

Thanks!
Larry


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