Micheal:

W. R. Grace has a product called M-7200 Peelable Mask.  It is used to protect
surfaces though the HASL process.  For more information call Mark Edson at
1-800-232-6100.  When using the product pay close attention to application
thickness.  Most peelable masks will become brittle and non peelable if they
are applied too thin.
Another trick I have seen used with the M-7200 is to peel it while the panel
is still warm.  This makes the peeling process much easier.  Hope this is
helpful.

Thanks,

Ben Quarles

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