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I'm not sure that I agree with your statement that coarser sand paper
provides more surface area.  Here's my thinking....and I'm not saying that
I'm right, but I do have a thought here (it happens once in awhile).......
I think that the finer sandpaper provides more surface area, because the
grit has less distance between it.  That provides more peaks and valleys,
which in turn provide more surface area.  If I use finer sand paper and get
100 groves per inch, I get more surface area than if I use a coarse paper
and get only 10 grooves per inch.  Thereby giving me more surface area.

Who knows for sure?

Curtis Krouse


[I'm not a mathematician, but I think if you were to compare what we are
doing to fractals you would, in fact, see that your assumption about finer
grit providing more surface area is true.   Given that fact, I still have
a hard time reconciling my mind to the idea that I'll get better bonds if
I prep with 180 grit instead of 40 grit.  Talk about counter-intuitive.

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