I have a couple of suggestions if you suspect bad nano-coat:
If you are evaluating SMT stencils,
Add a stencil coupon.  In that stencil coupon place your typical pads, steps, et cetera.  Also add a tape grid.  This is an altered grid resembling the G coupon used for soldermask adhesion.  Most stencil houses will add this to your stencil layout at no charge.
If you are looking at other parts with adhesion issues, then I suggest a Fisherscope ST200 (or just give Fisherscope a call as this may be dated or insufficient to read the coating thickness you are applying).