When to Schedule Bottom Paint in the Bay Area
Bay water is brutal on bottoms. Here's exactly when to repaint, what paint to use, and why most boat owners wait too long.
The SF Bay is one of the most fouling-prone bodies of water on the West Coast. Our combination of nutrient-rich runoff, moderate temperatures year-round, and active marine life means that a bottom that lasted three years in San Diego won't make it 18 months here. Here's how to tell when it's time, what paint to use, and why most owners wait too long.
How long does Bay bottom paint last?
Most ablative paints (Trinidad, Pacifica Plus, Ultra) last 18–24 months on a Bay slip. Hard paints (VC Offshore, Petit Trinidad SR) hold their copper longer but stop releasing as fast — you'll get 24–36 months but with more buildup. Race boats running thin coatings recoat annually. Trawlers and slow cruisers can sometimes stretch to 30 months.
Signs you've waited too long
If a diver is reporting 1/4" growth or more, the paint isn't working anymore. If you're seeing bare gelcoat patches at the waterline or rudder, it's recoat time. Worst case: blistering or barnacles attaching directly to the hull means the antifouling has failed completely and you're risking permanent gelcoat damage.
- Diver reports >1/4" hard growth between cleanings
- Bare gelcoat patches at waterline or trailing edges
- Barnacles attaching to hull (not just paint)
- Reduced top speed (typically 1–2 knots loss)
- Fuel economy down 15–25%
Best months to haul in the Bay Area
October is gold — the season is wrapping up, weather is still warm enough for paint to cure, and yards aren't booked solid. February–April is also popular but yards are slammed — book 6–8 weeks ahead. Avoid May–September if you can; the yards are wide open but you're losing your prime sailing season to the haul-out.
Which paint to choose
For a Marin / SF / East Bay slip with year-round use, we recommend Pettit Trinidad Pro (hard) or Pacifica Plus (ablative) for most owners. Sailboats race-prepping should consider VC Offshore (lower drag, harder to apply). Trawlers can use heavier copolymer ablatives like Trinidad SR. Always match your bottom paint chemistry — incompatible paints lift and peel.
- Cruising sailboat → Pettit Trinidad Pro or Pacifica Plus
- Race sailboat → Interlux VC Offshore
- Powerboat (cruiser/sportfisher) → Pettit Trinidad SR
- Trawler/slow cruiser → Pettit Vivid or Trinidad SR
- Aluminum boats → Trilux 33 (no copper)
What it costs
On a 35-foot boat in the Bay Area expect $35–$50 per linear foot for a standard 2-coat job — call it $1,200–$1,800 plus haul-out fees. Major prep (sanding to substrate, barrier coat, blister repair) doubles or triples that. Skipping prep to save money is the #1 reason paint jobs fail at 12 months.