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Hi Ralph.
I assume you hogged out with the 80. Sometimes after hogging out, the first few wets with the next finer grit go "backwards" because the hogged out curve was more of a hyperbola than a sphere. Depends on the strokes used to hog out. The finer grit with more general strokes 'may' be generating a better spherical curve before resuming to deepen the sag.
Dave
Last edited by dave brock; 13-01-2015 at 04:29 PM.
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