Rob wrote:
Just bought a Raymarine ST40 and the advice is to paint the log wheel
with a water based anti fouling paint. Have not been able to track
any down in UK - grateful for any suggestions.

TVMIA.

Try reading the cans or asking the manufacturers....

e.g. International Micron Optima is water based (emulsion paint) but
expensive.

A clue is the drying times look more like 24 hours than 12 hours as the
water has to dry off first before the paint starts to cure.