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I recently had Greg Kress out to help me with some work on my Lancair. he
has a masters degrees in composite repair. Greg felt that the industrial
standard rule was to final sand with 80 grit max, 120 grit min and that
solvent should never be applied to the bond After sanding as per Boeing and
MD standards. Glad he told me this after I cleaned all my bonds with MC
prior to bonding.....

surface roughness is measured as "R" factor and there is an associated
surface area as a function of "R". the area goes up as the cut valleys get
deeper which happens as the grit particulates get larger. I work in the
synthetic diamond industry and we try to maintain maximum surface area for
bonding synthetic diamond to carbide. over the years these interfaces have
evolved to a sine wave with an amplitude of ~1mm. looking at a sine wave you
can see it has more length to travel/surface area than a flat line. we get
1.5 to 2x the surface area of a flat surface. Hope this helps.

Scott

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