We recently had some issues with lack of adhesion of Parylene coating

What types of notes are being used on drawings to define parylene 
conformal coating adhesion test on pwa's?
Is the ASTM3359-08 (for assessing the adhesion of coating films to 
metallic substrates) the best spec to call out for this testing .
I presently don't have pwb coupons to perform destructive cross hatch 
test.

What type of tape is being used testing parylene adhesion on the PWA's? 
Some specs call out 3M-250 tape, the ASTM D 3359 calls out the Permacel 
99.
Actually I prefer the Wescorp 79210 clear Anti-static Tape, does this seem 
acceptable?

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