Yeah, believe it or not I STILL see some of those
old boards with the wrinkly mask.

On Wed, Jul 29, 2009 at 7:04 PM, Gary Boccoleri <[log in to unmask]> wrote:

Seems like I remember doing this on outer layers because HASL would reflow under the solder mask and look ugly. Strickly a cosmetic thing. This was way back in the 1980s though.

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