Fiberglassing
I also like how a
sheath of fiberglass over the entire hull and deck
improves the durability and gloss of the finish, whether you
use varnish or paint. Indeed, if you use low-viscosity epoxy, the
fiberglass will be invisible beneath varnish.
Smooth up the hull
with 80 and 120 grit sandpaper, taking care to round over
the chines and keel to about a 3/8-inch radius; fiberglass
won't smoothly turn a sharp corner. With your boat upside down on
sawhorses, drape the dry hull with cloth. Roughly trim the
cloth to the sheerline, leaving maybe an extra inch all
around. Gently smooth the wrinkles out, working from the
middle of the boat towards the ends. You'll be surprised
how easily the cloth conforms to the shape of the hull,
even the stem and stern, without cutting darts or seams in
the cloth. In all likelihood, the only place you'll need
to cut a dart is at the extreme stern.
Second and third coats -
When the first coat has tacked up or cured, you will now
fill the weave with additional coats of epoxy. Sometimes I
can manage to fill the weave with just a second coat, but
this time the weave of the cloth will not be soaking up
resin, and an overly thick coat will run and make a big mess on
the floor. Many thin coats are always preferable, and count on at
least three. Ideally, when enough epoxy has been applied,
the hull is smooth and glossy without the weave of the
cloth showing anywhere. Take a look at our Shop Tip When Have I Filled the Fiberglass Weave with Epoxy?
Fiberglassing the deck -
The deck is 'glassed prior to the installation of the
cockpit coaming. Carefully round-over the hull-to-deck
joint; a 3/8" radius or more is ideal. Drape 4oz cloth over the
deck as with the hull. It's economical to divide a shorter
rectangle of fabric into two narrow triangles with a seam
at the cockpit. The cloth should overlap the sides of the
hull about 1.5 to 2". The 4oz takes
less epoxy to wet out. Be careful not to let the epoxy
run down the sides in big, hard-to-sand rivulets.
When
you've filled the weave of the deck 'glass, sand it smooth
with 120, then 220 grit. The overlap on the sides of the hull is
"feathered in" with the sander.
What if I want to varnish my hull? -
No need to worry. 4- or 6-ounce fiberglass cloth will be
almost perfectly clear and will look fine beneath coats of
varnish. Some precautions, though: you'll want to be sure
you have the fiberglass cloth completely filled with epoxy, even
if it means extra coats. If you sand into the fabric anywhere,
that area may show up under the varnish as a foggy spot in
the finish. Also give serious thought to the use of a
low-viscosity epoxy like MAS Epoxies.
Thicker epoxies make it difficult to wet out fiberglass,
and the excessive kneading of the clear epoxy will inject zillions
of microscopic air bubbles into the epoxy, creating cloudy or
milky spots all over your hull that are impossible to get
rid of.
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