I've seen this for two different reasons. I'm not familiar with them but was told
a little about it when it happened. 1 was because the cleaning was
different chemistry then the mask required (ended up using the "recommended"
wash) The other was a bad batch of solder mask and it wouldn't cure or set.


Chris Robertson
[log in to unmask]
  ----- Original Message -----
  From: Steve Gregory
  To: [log in to unmask]
  Sent: Tuesday, January 13, 2004 3:01 PM
  Subject: [TN] "Snake Board"...


  Hi All!

  You're probably wondering; "What the heck? Snake board?" That's what I call
  it.

  Built this assembly (all PTH), waved it, and then washed it, went to get it
  out of our cleaner, and all the solder mask is coming off in big slabs just
  like a snake does when he sheds his skin! Go look at "Mask Peel, Mask Peel 2, &
  Mask Peel 3" at:

  http://www.stevezeva.homestead.com

  I wash in a Electrovert MCS-1000 with Kyzen XJN, and the mask on the board
  was a Dupont Vacrel dry film. Never have had a problem with Vacrel dry films.

  The mask doesn't look degraded, or damaged in any way...it's just not stuck
  to the board! Anybody ever seen this happen before? Unfortunately, this was a
  rather expensive assembly.....:^{

  Nice way to start the year off, huh?

  -Steve Gregory-

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