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Heat exchanger zinc?
Never paint a zinc.
We always paint our shafts, props, etc. but some people say not to.
Never paint the area where the zinc will be attached (shaft etc.).
Bottom paint is usually rolled and/or brushed, not sprayed.
Pettit has lots of competition in bottom paint, ask around in the area you will be going to find out what works.
Transducers are a good source of argument. Most say not to paint the depth sounder, some say it doesn't make any difference. We always left it bare until we forgot once and it didn't seem to make any noticeable difference. We always paint the knotmeter, just remember to make sure it spins freely after it's dry and before you launch.
Let's see -- When you install a shaft zinc, make sure the bolt heads are facing in the direction of rotation when the trans is in forward. When you install the shaft zinc, tighten down firmly, tap it with a hammer, then tighten again. You don't want them coming off unnoticed.
Enjoy your new horizons.
Sail Fast Live Slow
36' Solaris Sunstar catamaran