Regal 53 SC Owner's Manual page 436

Troubleshooting
BOTTOM PAINT
Factory installed antifouling paint is a top-of-the-line
product but does need periodic touching up. No paint
can be effective under all exposure conditions. Man made
pollution and natural occurrences can adversely affect
antifouling paint performance. Extreme hot and cold
water temperatures, silt, dirt, oil, brackish water and even
electrolysis can ruin an antifouling paint.
Therefore, the vessel bottom needs to be checked
periodically to make sure it is clean and no growth is
occurring. Lightly scrub the bottom with a soft brush to
remove anything from the antifouling surface. Scrubbing
is particularly important with vessels that are idle for
extended periods of time.
The coating is most effective when the boat is being used
on a continuous basis.
On select yachts maintain a 1" to 1 1/2" clearance from
all anodes, drive units and other underwater gear. Never
paint over anodes.
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