Mercury D4.2L Manual page 103

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In addition to the corrosion protection devices, the following steps should be taken to inhibit corrosion:
IMPORTANT: Corrosion damage that results from the improper application of anti-fouling paint will not
be covered by the limited warranty.
1
Painting Boat Hull or Boat Transom: Antifouling paint may be applied to boat hull and boat transom but
you must observe the following precautions:
IMPORTANT: DO NOT paint anodes or MerCathode System reference electrode and anode, as this will
render them ineffective as galvanic corrosion inhibitors.
IMPORTANT: If anti-fouling protection is required for boat hull or boat transom, copper or tin base
paints, if not prohibited by law, can be used. If using copper or tin based anti-fouling paints, observe
the following:
2
Avoid any electrical interconnection between the MerCruiser Product, Anodic Blocks, or MerCathode
System and the paint by allowing a minimum of 1-1/2 in. (40mm) UNPAINTED area on transom of the boat
around these items.
3
Painting Drive Unit or Transom Assembly: Drive unit and transom assembly should be painted with a good
quality marine paint or an anti-fouling paint that DOES NOT contain copper, tin, or any other material that could
conduct electrical current. Do not paint drain holes, anodes, MerCathode system, and items specified by boat
manufacturer.
4
Spray power package components on inside of boat every 2-3 weeks with Quicksilver Corrosion Guard to
protect finish from dulling and corrosion. External power package components may also be sprayed.
5
All lubrication points, especially steering system, shift and throttle linkages, should be kept well lubricated.
6
Flush cooling system periodically, preferably after each use.
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