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Probably vesication (myriad minute blisters caused by humidity being attracted from the air to hygroscopic contamination under the mask. Cure: a thorough, controlled cleaning before applying the mask.
Brian
Phil Crepeau wrote:
> hi,
>
> we have some boards with a clear, colorless soldermask that i would guess is lpi. the body of the mask is shot through and through with something that looks a lot like measling (but of course isn't, it just looks a lot like it). any of you all seen anything like this?
>
> phil
>
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