STEP TWO: COARSE FILLING
..... You must be extra cautious in this step or you may destroy your
structure. When you take a piece of sandpaper and start grinding on
your composite structure it's like using acid to clean a metal wing
spar. It must be done carefully! Start by determining which areas
require micro filler as shown using a flexible yard stick and a
scale. Prepare the areas to be filled by hand-sanding lightly. Do not
try to use a sanding block or spline on these areas.
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