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Iron Phosphate on Alum 383 - coating wgt control

I may need to control the coating weight of iron phosphate dip process on Alum 383 for cosmetic and electrical reasons.
We currently spec TT-C-490 [from DLA] type 2 ( 35 mg/ft2 ) which is a minimum spec and a dip process.
Question?
If we narrow the coating thickness requirement to 35-50 can it be reliably repeated given the process using the standard process controls?
Significant impact on cost?

Joe Harmuth
QA- end user - Meriden, Connecticut
August 30, 2008

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