Columbia Coronado 25, Owenrs Manual

Page: 87 / 115

SECTION 6
Page 7
6.2.1 (continued)
2. Apply the putty firmly in the void with a putty knife to force out
all the trapped air. Build up the damaged area about 1/9" above the
surface.
3. 'Immediately after you have applied the putty, place a piece of
cellophane over the patch to start the cure. The cellophane
should overlap the patched area about 1 inch on all sides.
4. With a single-edge razor blade, squeegee over
the cellophane to remove excess putty and air
bubbles. Hold the razor blade at as low an angle
as possible, that is, almost flat in relation to
the surface. This technique leaves enough excess
gel coat in the patch to allow for shrinkage and
removes most of the remaining excess gel coat from
the area. If you do not allow shrinkage, the
gel coat will be below the surface when it cures,
and you will have to apply additional putty.
S. With the razor blade, and before the gel coat cures, scrape
off the excess gel coat that you removed from the patched
area in Step 4 above.
6. Allow the putty to become firm and hard to the touch. Then
remove the cellophane.
D. Sanding the Patch
1. Block-sand the patch with 220 grit sandpaper to remove the
excess putty and to restore the area to its original shape.
2. If tiny pin holes appear in the patched area after you have
removed the excess putty, apply additional putty as instructed
in Steps
A through C below. If there are no pin holes, go on
to Step 3.
IMPORTANT
Confine the sanding operation as close as possible to the patch. Pay very
close attention to the area at all times. In that way you can remove the
excess putty and contour the area properly without sanding through the gel
coat to the fiber glass.
As a result, you won't have to spray the area in
order to restore the surface to its proper condition.
a. Apply just enough putty to fill the pin holes. In
that way the area will require very little sanding.