Boston Whaler 20 Justice Series, Operation & Maintenance Manual

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6-9
Boat Maintenance Section 6
Barrier coating is a process where a vinyl ester resin
is applied to the boat’s bottom. This process is compli-
cated and very lengthy, including a long “drying out”
phase. The vinyl ester resin barrier coat is then cov-
ered by conventional bottom paint. This process
should only be done by a professional fiberglass repair
facility.
The second process is conventional bottom paint-
ing using a high-quality product. Bottom painting
slows the process of hydrolysis and protects your boat
from most types of marine growth. If the boat has
never had bottom paint, consider using one of the
newer formulations of paint that does not contain cop-
per compounds.
To determine the waterline, place the boat in the water
with a full load of fuel and gear and mark the waterline.
Measure above the marked line about two inches (5
cm) for placement of the tapeline. Use a vinyl/rubber
masking tape such as 3M
®
471.
!
CAUTION
Some compound of copper is the active
ingredient in most conventional bottom paints.
Do not apply any copper-based bottom paints
to the engine bracket or the engines. Severe
damage resulting from galvanic corrosion will
occur.
!
WARNING
There are risks and dangers associated with
using paints and solvents. Follow all the
manufacturer’s guidelines and precautions
while painting your boat. Dispose of all
painting supplies following all local regulations.