"Cy Galley" wrote in message
news:BJxKd.33031$EG1.4274@attbi_s53...
Why sand at all. Steve Beert's prize winning Long was sandblasted, then
micro was squeegee over the top , then a little sanding and paint prep.
Well, on sailplanes, anyway, you sand to make sure the airfoil is the right
shape, (shrinkage can occur over the spars after some time out of the
molds), and to make sure that any waves in the contour are less than .004
inches.
Tim Ward
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