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The
following are recommended procedures for re-spraying:
1.
The objective is to re-spray and sand thoroughly, leaving no
shiny spots.
2.
Sand the area with 220 grit sandpaper using a block or an
orbital sander. Do not sand with your fingers. This will cause
distortion in the surface creating dips or groves.
3.
Sand the area twice the size of the area to be re-sprayed.
4.
Clean the surface using a solvent and a clean rag. All contaminates
left on the surface will affect the adhesion of gel coat.
5.
Tape off the area to be worked-on where possible on a sharp
break or contour adjacent to the area - even if this means
expanding the area slightly in size. This minimizes any slight
color or texture differences after spraying.
6.
Areas that may possibly be exposed to overspray should be
covered. Mark the adjoining area to indicate where the actual
spray spot is. This will make it easier to keep track of where
you should concentrate your millage.
7.
Use gel coat from the same batch the part was sprayed with.
8.
Catalyze the gel coat with 2% catalyst by weight. Gel coat
can be thinned with Styrene. Do not use more than 5% Styrene
or your cure may be inhibited.
9.
Stir the mixture thoroughly. It is advisable to use a metal
putty knife for stirring the gel coat mixture. A wood stirrer
will absorb the catalyst and affect the catalyst percent.
10.
Use a siphon spray gun. Test the gun on a panel to adjust
the spray pattern. The smaller the area to be sprayed, the
more the air pattern and fluid flow should be closed. Air
pressure should be at approximately 20 - 40 lbs.
11.
Position the lighting so you can see the spray pattern as
it forms on the surface.
12.
Spray the patch area uniformly. Avoid producing runs. Move
in horizontal and vertical passes while spraying. Allow proper
flow to minimize orange peel. Produce a sufficient build up
of gel coat for sanding and buffing. Lower the millage output
toward the ends of the sanded area to form a feathering effect.
Do not spray outside the sanded area.
13.
Clean your equipment immediately after the spraying. Flush
with clean solvent. Fill the container with solvent, spraying
the solvent through the gun. Back flush the siphon tube by
blocking the nozzle of the gun to force solvents in and out
of the tube.
14.
Allow the gel coat to cure overnight.
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