Steve,

4 mil dryfilm over 4 oz. copper is not possible specially with low  spacing.

We have done LPI first and then dryfilm (successfully)...but it would be
tricky for these brds.   They may have to cover very deep "valleys" w/  LPI
before using dryfilm.  They may have to apply 2 coats of LPI and vac.  them to
reduce chances of trapping air bubbles.

Rush
Accurate Engg Inc.

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