Paint Manual - Dove-Medows Marine Coatings Ltd

22
General painting advice
Apply antifouling over primer Wet scrape to remove old antifouling
Antifouling
Most antifoulings are compatible and
can easily be overcoated, however:
• The surface must be in good
condition, free from contaminates.
• Hard antifoulings leave an
exhausted layer of resin at the end
of the season. Wet abrade surface
before applying new anti-fouling.
• You can overcoat Teflon antifouling,
if it’s in good condition and has
been washed. Do not abrade
before applying new antifouling.
• A traditional/soft antifouling
should be sealed with Underwater
Primer before applying an erodible
or hard antifouling on top of it.
• Keep the antifouling product
indoors before painting as it’s
easier to apply if it has been stored
at “room” temperature.
• Always give antifoulings a good stir
with a bladed instrument before
applying, as they contain heavy
pigments which can settle.
• Apply an extra coat along the
waterline and the leading edges,
where water flows strongest.
• It’s not advisable to thin
antifoulings. However, in
particularly cold conditions,
thinning it by up to 10% will help
with application.
• Never dry sand old antifouling,
as the dust is toxic.
Key Advice:
If you’re changing your antifouling,
check the instructions for applying
the new product onto your existing
product. If in doubt, apply a tiecoat
of an antifouling primer.