How often do you need to Antifoul a boat?

To ensure that your boat is well looked after, it is recommended that you book in for an antifoul every 9-15 months.

Do you need to prime before antifouling?

If you are starting from scratch with a bare hull or you’re applying on top of an unknown antifoul, you will likely need to apply a primer before using antifoul. If you are starting from a bare substrate, you will need to apply an antifoul primer such as Hempel Underwater Primer or International Primocon.

How often do you need to Antifoul a boat? – Related Questions

Should I repaint the bottom of my boat each year or just touch it up?

In general, you should apply boat bottom paint once a year, however; some bottom paints can last for two years. If your boat is kept in the water or you use it regularly, you you have it checked annually to determine if it requires a new bottom paint coating.

Do I have to sand before bottom paint?

Scuff Sand the surface

Scuff sand to a dull looking surface with 80-100 grit (no finer) sandpaper, then rinse with water and allow to dry. If your old bottom paint is really chalky, consider giving it a more agressive sanding to insure proper adhesion of the new bottom paint.

Do I need to remove old antifouling?

If your existing antifouling is in poor condition, we strongly recommend removing it completely before repainting. There are two methods outlined below, but you could consider employing a professional antifouling paint remover who will use equipment that’s not suitable for a DIY boater.

Can I paint over old bottom paint?

Known Compatibility of Existing Bottom Paint:

Scuff sand with 80 grit sandpaper, or scuff with a 3M Scotch-Brite® 7447 pad scrubbing thoroughly. Remove all residue and let dry. Apply minimum of two coats of antifoulant. Allow 3 to 6 hours between coats and a minimum overnight dry.

Can ablative bottom paint be applied over hard bottom paint?

Ablative paint is great for boats that are used more often. You cannot put hard paint over ablative paint because the ablative paint sloughs off and will take your hard paint with it. Ultimately, you choose which paint you want and we’re here to help with any questions or suggestions for your boat.

How many coats of bottom paint do I need?

Most ablative / self polishing bottom paints require 2 coats since they are designed to wear away over time. More is better than not enough bottom paint! Most hard modified epoxy bottom paints will require just one good coat (just don’t miss any areas!)

What bottom paint does the Navy use?

The US Navy has used SEA-SPEED since 2001. It is ideally suited as an aluminum boat paint, particularly on Special operations (SOC) type vessels, patrol and riverine craft that are very high speed and used in extreme conditions. It can be applied to steel or aluminum hulls on all types of Military craft.

Do you prime before bottom paint?

Primer for bottom paint is not necessary. However, if you use Tuff Stuff marine epoxy primer on the bare fiberglass, it will provide protection against blisters and any moisture. It will also improve adhesion to the hull.

Do you paint from the top down or bottom up?


Once the room is ready to paint it’s best to work from top to bottom, start on the ceiling and work your way down.

What happens if you don’t bottom paint your boat?

Boat bottom painting is necessary for any boat that stays in the water continuously for long periods. Bottom paint, also called anti-fouling paint, deters the growth of aquatic organisms, plants, and algae that damage your boat’s hull, affect the boat’s performance, and add a continuous ongoing maintenance chore.

Does freshwater need antifouling paint?

We do recommend applying some kind of antifouling paint unless the boat will live on a trailer. An unprotected hull on the Great Lakes, or any freshwater lake, is vulnerable to both soft growth (algae and slime) and hard growth (shellfish).

How many coats of bottom paint should I put on my boat?

Amount of Paint

Remember, most antifouling paints feature ablative or self-polishing formulas, and wear away as the boat moves through the water, so you will want to apply 2 coats*. Applying only a single coat to your boat’s bottom may result in ineffective protection from barnacles, slime, and weeds.

How long can you leave an unpainted boat in the water?

A boat can only safely stay in saltwater for about one week, but in most cases, three to four weeks in freshwater will not cause damage. When you leave a boat sitting in water, it never gets a chance for the construction materials to dry out.

Should you store boat with full tank?

Marine engine manufacturers and technicians advise storing any boat with the fuel tank almost full, leaving just a little capacity to accommodate expansion of the fuel if the temperature warms.