Riva 90 ARGO - Page 391

13 - HULL AND FURNITURE MAINTENANCE385
13.4.1 Bottom hull
Antifouling treatment
If scales build up on the hull, this causes a remarkable speed reduction and
with time may damage the “gel coat”. When you choose an antifouling paint
for your yacht, it is important that you nd the proper product, suited for your
yacht and for the waters in which you are going to navigate. Contact the
RIVA Service Department.
Check/restoration
The cleaning and checks have to be carried with yacht at dry shore or with
the help of a diver. Have the repairs done only with yacht at dry shore.
WARNING
To clean and check the yacht in water: disable the engines and genera-
tors ignition.
CAUTION
There are some hull areas (fastening area of thruster shaft support base,
submerged drainage areas, areas around thruster tunnels and shaft ex-
its, etc.) where operations can be carried out after hull pressing; in these
areas, llers are usually used which, over time, may produce local faults,
like bubbles or small cracklings. These little faults do not impair the hull
mechanical strength at all. To repair them just sandpaper the area, re-
move the bubbles, and apply llings suitable for the bottom hull.
• Have the bottom hull accurately cleaned, as well as the rudders and
stabilizer with brushes (water) or a jet-cleaner (dry) to remove seaweed
and scales.
• Let check the paint situation of the bottom hull. If necessary, have 2
coats of suitable antifouling paint applied by specialized personnel.
Preparation of the surface of an already treated yacht
Carefully check the old anti-fouling paint to see if it is still good or if it needs
a new layer. Verify that the new product is compatible with the old one. Con-
tact the RIVA Service Department.
If the old antifouling is crusty, thick and tends to scale off, then remove it and
start the treatment as for a new yacht.
CAUTION
Antifouling is poisonous and should never be burnt, use only author-
ized disposal procedures and in case of doubts contact the authorities in
charge. The sandblasting operations and removal of antifouling must be
carried out with suitable clothes and protections.
WARNING
During the application of antifouling, make sure that following parts of the
bottom hull are not painted:
• Depth Sounder Transducer
• Log Speed Sensor Paddlewheel
• Sacricial Anodes
• Shafts and Propellers