YOUR GUIDE TO PROJECTS, SKILL BUILDING + WHAT’S NEW
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A smooth, shiny
finish after painting your hull is the
result of careful
per. But DO NOT sand off the entire
gelcoat. If you remove the gelcoat, you
will have to reapply it and spend at least
another week refairing it.
If the oxidization is minor, the boat
has already been painted once or twice,
or the hull has rust or exhaust stains on
it, use 220- to 300-grit sandpaper on a
random-orbit sander or longboard.
>> 3. If you’ve used a random-orbit
sander, stretch a thin batten (
measuring 3/4 inches by 3/4 inches by 10 or 12
feet) along the hull and look for hollows
and dips. These should be filled before
proceeding using Interlux Interfair,
AwlGrip AwlFair, EMC2 QuantumFC,
or a filler compatible with the paint you
will be using.
>> 4. Sand smooth any filled patches,
and check the hull fairness with your
batten. Repeat until your hull is perfectly fair, then sand with a longboard
using 320- to 400-grit to get a perfectly
fair finish. Finally, thoroughly clean the
hull so it is completely free of dust and
ready to receive paint.
>> 5. Apply an undercoat. The undercoat
should be compatible with the topsides
paint you intend to use. You can roll and
tip or brush the undercoat onto the hull.
Many painters use an undercoat that is
the same color as the topcoat. This is
especially important if you are changing
from a dark-colored to a light-colored
hull or the other way around.
>> 6. After applying the undercoat, let
it dry according to the manufacturer’s
recommendations, then sand again with
300- to 400-grit. Check the smoothness
of the hull with your batten. You may
need to apply a second undercoat if you