If you have to fill any underwater surfaces as a result of hitting an underwater object or over enthusiastic use of a scraper, do not under any circumstances use a polyester filler, use only an epoxy based one such as International Watertite.
When masking water lines make sure you use the ‘Blue’ 14 day tape product which not only gives a good crisp line but can also be easily removed on completion of the paint job. If you use standard paper masking tape ensure you remove it immediately you have finished painting; However if you have had the misfortune to leave this style of tape in place and find it impossible to remove, 3M Citrus Cleaner is an excellent product to assist, WD40 is also worth a try.
Wear disposable gloves and eye protection when applying antifouling as splashes on hands and face irritate the skin and using thinners to remove them can make it worse by driving the material into the pores making it difficult if not impossible to remove.
Apply the correct number of coats of antifouling as recommended by the manufacturer – usually a minimum of two, on high pressure areas on your hull (leading edge of keel, rudder etc) they can benefit with the addition of a patch coat before painting the whole hull. Do not be tempted to thin the antifouling, you are diluting the active ingredient! Use a roller as it will give a better coverage and finish than using a brush, if using a plastic paint tray place it / cover it in a plastic carrier bag before use, not only will you be able to use it again, many solvents in antifouling melt plastic paint trays leaving you with a sticky mess to roll onto your hull!
Do not paint over your transducer with conventional antifouling, use a water based antifouling such as Echo, it is water as against solvent based so will not damage the transducer surface nor weaken the signal!
Specific Boot topping paints such as International ‘Trilux’ or Hempel Waterline Boot Top perform better than standard antifouling as they tend to be of the ‘hard’ type, are stronger and will stand up to the occasional scrub during the season.
Propellers should be cleaned and polished with fine emery cloth or wet and dry. If you are in a heavy fouling area coat with Sea Jet Peller Clean or International ‘Prop-o-Drev’ this will help keep the prop clean whilst a coating of Propshield will be of benefit in lesser fouling areas. Dispose of masking tape, rollers and safety wear responsibly when you’ve finished.
Anodes, remove if possible before antifouling, if there is still 2/3rds left and you’re leaving them in situ, either mask off or coat with soap before you start work, antifouling on the anode surface will prevent it working!