<< We are currently having to mask off on a typical board, 4 x 4.5mm hole
 with large lands, 1x3mm hole with large land, 3x1.5mm hole & 4 pads for
 LED's.
 All but the LED's are too big for screened on peelable resist (drips
 through), and we cannot apply that to the SMT side.  >>

Matthew,
   In my previous experience this would not be a problem at all for a PVA
coating system to selectively coat, then cure.  The main issue to consider is
the smallest spacing between things that must be coated and things that must
be left uncoated.  I worked with spacings as small as .020 without much
problem.

Jon Moore

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