Gary,
     About 2 years ago, I had a product which had greater than 1000
components (0603) on the underside.
     No issue

     The underside was printed using a 0.010" stencil and Locitite 3607.
     The aperture size was an oblong shape , 0.030" long x 0.015" wide.
     A minimum of 0.010" gap between the aperture and pad, both sides.
     The 0603 pad was 0.043" x 0.026".

     Hopes this helps you

     Felix

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