Racing sailboats used in freshwater are an especially good candidate for these paints. Like ablative paints, sloughing antifoulings wear away as the boat moves, so the more often the boat is used and the faster it goes, the quicker the paint wears off.
Sloughing paints are very soft, so few paints can be applied over them. Vinyl-based paints are slick, hard paints that can be burnished to provide a smooth surface preferred by owners of performance boats.
Unlike thin-film paints, vinyl paints like VC Offshore can be used in salt-water, although their antifouling effectiveness is inferior to high-quality modified epoxies and ablatives. Vinyl-based paints can only be applied over an existing vinyl paint. Very thorough sanding is required to achieve a good bond when painting over vinyl coatings with other types of bottom paint.
Never apply an antifouling paint that contains cuprous oxide on an aluminum hull or outdrive. Doing so will result in galvanic corrosion that will damage or even destroy the hull.
For painting underwater metals, Propspeed has emerged as one of the most popular formulations on the market today. Propspeed contains no biocide at all. Instead, it is a super-slick coating that easily sheds marine growth.
Propspeed is used on underwater metals, including props, struts, shafts and keel coolers. The big news here is that the popular anti-slime additive Irgarol is, after an absence of several years, back! Irgarol disrupts photosynthesis in plants, which makes it an effective additive for controlling slime and preventing that ubiquitous waterline "beard".
Micron Extra by Interlux is an example of this type of paint. Other choices include paints boosted with the anti-slime biocide zinc pyrithione, also called zinc omadine. As restrictions on copper-based antifouling paints increase, a pharmaceutical alternative has emerged. Depending on the paint formulation, ECONEA can be as effective as cuprous oxide at about one tenth the concentration in paint by weight. Good preparation and priming are the basis for any paint job and antifouling paints are no different.
Solid prep ensures good adhesion and better performance over time. If you are painting a new boat for the first time, wipe down the entire bottom with a good solvent wash such as Interlux or Pettit Dewaxer to get rid of all mold release agents from the factory. To avoid just spreading the mold release agent over the hull, turn your cloth frequently and replace often with a clean cloth. You can then lightly sand the hull with grit sandpaper or use a no sand primer instead, such as Interlux Fiberglass No-Sand Primer or Pettit Sandless Primer.
However, since most of us will be recoating over a previously painted bottom, we will need to make sure the surface is prepped for another coat.
If the old paint is known and in good shape: Remove old loose paint, dirt, grease, and marine growth with a power washer, brush or scraper. Wipe down with solvent wash. Sand with grit paper.
Exercise caution to avoid sanding through a barrier coat that may have been applied to prevent fiberglass blistering or damaging the gelcoat of the hull.
Repeat solvent wash. Clean with the thinner recommended by your paint manufacturer. What are the Different Types of Antifouling Paints? Ablative Bottom Paint Ablative paint is designed to gradually wear away as water flows beneath the hull, either from use or from the movement of tides and currents. Self-Polishing Copolymer Ablative Bottom Paint This type of antifouling paint also wears away gradually to expose fresh layers of biocide, but the self-polishing properties of its controlled-release copper copolymer formula make it work whether the boat is at anchor or underway.
Hybrid Copolymer Ablative Bottom Paint Hybrid bottom paints are self-polishing and release biocides at a controlled rate like copolymer bottom paints do, but hybrid paints can be burnished—like a hard bottom paint—for smoothness and speed. Location is Everything! Length in feet x Beam in feet x. If you want to paint in the fall and launch in spring without repainting, choose a multi-season self-polishing copolymer paint.
This type of bottom paint has an unlimited launch window. All bottom paint manufacturers have a compatibility chart that shows the compatibility of their bottom paints with those of existing brands. Be sure to take a look at the compatibility chart before you buy. JD Select Antifouling Paint. Eco-friendly, water-based ablative antifouling for excellent single-season protec Ultra-smooth, durable bottom paint for fiberglass and wooden boats.
Antifouling paint that provides single-season protection against hard marine growth. TotalBoat Spartan. TotalBoat Krypton. TotalBoat JD Select. TotalBoat Underdog. TotalBoat Outdrive AF. According to West Marine, generally softer paints can be applied over hard paints, but not vice-versa, and vinyl paints should only be applied over vinyl paints. Another benefit is that these paints do not lose their antifouling ability when exposed to air, which means that prior to winter storage, you can paint your boat and be ready to launch in the spring.
Ablative paints also have less copper than modified epoxy paints. Hard modified epoxy paint prevents growth by leaching biocides upon contact with the water. These paints adhere to most surfaces, are more abrasion resistant, and can be applied over most types of paint, according to West Marine. However, build-up will occur with each new coat of paint, and eventually your hull will need to have the coating stripped. Antifouling paint that contains cuprous oxide should never be applied to an aluminum hull or outdrive as it will cause galvanic corrosion.
Instead, boaters should select an antifouling paint that contains cuprous thiocyanate, or a copper-free antifouling paint that uses non-metallic ECONEA as the biocide. Some boatyards are responding to these health risks by no longer allowing boat owners to do DIY antifouling. If your hull has a nice slick paint job then you may not notice much effect. Plus, ablative bottom paint is designed to lose its protective properties over time. You may find slime starting to grow, or the paint job could get a bit rough.
Many boat owners replace their antifouling annually. More and more boatyards are banning owners from doing their own DIY job because they want to control risk factors and insurance. That means more expense for you. The State of California already has. Washington State was due to ban copper in bottom paints in
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