113
360 C
OASTAL
Chapter 13:
ROUTINE MAINTENANCE
13.1 Exterior Hull and Deck
Hull Cleaning-Below The Water Line
When the boat is removed from the water, clean the outer
bottom surface immediately. Algae, grass, dirt and other
marine growth is easier to remove while the hull is still wet.
Use a pressure cleaner or a hard bristle brush to clean the
surface.
Bottom Painting
If the boat is to be left in saltwater for extended periods, the
hull must be protected from marine growth by antifouling
paint. Because of variations in water temperature, marine
growth, and pollution in different regions, your dealer and/or
a qualified boat yard in your area should be consulted when
deciding what bottom paint system to apply to your hull.
This is extremely important as pollution and marine growth
can damage fiberglass hulls.
Osmosis blistering is caused by a chemical reaction between
water and substances in the hull laminate below the water-
line. If water breaches the exterior gelcoat and barrier layer,
it can react with the chemical components in the laminate
creating acidic substances. These substances create pressure
behind the gelcoat which causes blisters. An epoxy barrier
coating such as the Interlux Interprotect
®
system properly
applied to the hull before bottom paint will help prevent this
problem. A Barrier coating also provides an excellent base
coat for the bottom paint.
Even though the hull on your Wellcraft is built with a layer
of blister resistant resin, we recommend that additional pro-
tection from marine growth and pollution be provided by a
barrier coating system and antifouling paint if the boat is to
be left in the water for over two weeks. This is extremely
important as pollution and marine growth can cause osmosis
and damage fiberglass hulls.
SANDBLASTING THE HULL BOTTOM WILL DAMAGE
THE FIBERGLASS. USE A FIBERGLASS WAX
REMOVER AND SAND TO SCUFF THE GELCOAT
SURFACE. THE INSTRUCTIONS AND
RECOMMENDATIONS OF THE BARRIER COATING
AND ANTIFOULING PAINT MANUFACTURERS
SHOULD BE FOLLOWED EXACTLY.
BARRIER COATINGS AND BOTTOM PAINT SHOULD
BE APPLIED ONLY BY QUALIFIED MARINE
PROFESSIONALS IN A BOAT YARD OR
DEALERSHIP THAT SPECIALIZES IN THEIR
APPLICATION. USE ONLY STANDARD, HIGH
QUALITY ANTIFOULING PAINTS AND BARRIER
COATINGS FROM NAME BRAND MANUFACTURES
SUCH AS INTERLUX AND PETTIT.
Most bottom paints require some maintenance. Proper main-
tenance is especially important when the boat is in saltwater
and not used for extended periods or after dry storage. If the
hull bottom has been painted with antifouling paint, contact
your dealer for the recommended maintenance procedures.
Sacrificial Anodes
Sacrificial zinc anodes are installed on the inboard engines’
freshwater cooling system and on the transom. The transom
zinc anode is connected to the bonding system and protects
the rudder assemblies, shaft logs and other underwater hard-
ware that is bonded. The propeller shafts are connected to
the bonding system by bonding wire that is connected to a
contact brush that rubs on the shaft. You should check the
brush frequently and make sure it is not worn and that it is
making contact with the shaft. Additional zinc anodes are
installed on the propeller shafts and should be on the trim
tabs if the boat is to be left in the water.
The anodes are less noble than copper based alloys, alumi-
num and stainless steel. They will deteriorate first, protect-
ing the more noble engine and underwater hardware against
galvanic corrosion. Anodes should be checked monthly and
changed when they are 50 - 75% of their original size. When
replacing the anodes, make sure the contact surfaces are clean,
shiny metal and free of paint and corrosion. Never paint over
the anode. The bonding system should be inspected by a
qualified marine electrician once a year to make sure all con-
nections are sound and there is continuity throughout the sys-
tem.
Boats stored in salt water will normally need to have the an-
odes replaced every six months to one year. Anodes requiring
replacement more frequently may indicate a stray current
problem within the boat or at the slip or marina. Anodes that
do not need to be replaced after one year may not be provid-
ing the proper protection. Loose or low quality anodes could
be the problem. There could also be a problem in the bond-
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