seeger418
18.06.2021 20:50:24
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Photo by Jerry Wyszatycki
When I asked Jim Seidel, assistant marketing manager at Interlux, the world’s largest marine paint company, about this anecdote he intimated that the frequency with which you use your boat influences your need for prop paint. Seidel says, “The more you use your boat, the less likely [your props] will collect shells. If you use it every week and scrape your props occasionally it may stay clean on its own. But if your boat sits unused more than ten days at a time, you’re going to need prop paint.”
Getting parts to bare metal is the key to getting a good bond between the paint and the surface.
Here’s a common, if unwelcome, sight for boaters: You go to pull your boat out of the water for winter lay-up or perhaps an overland haul on the trailer, and you notice that your boat’s propellers have morphed from the once-streamlined tip of your propulsion system’s spear into a shaggy, shell-laden mess. Maybe you noticed something was off with your props before this. The cumulative effects of slime and barnacle growth on a prop can cut down its efficiency anywhere from less than ten percent to, well, all of it. That’s right, get enough growth on your props and you will almost literally be spinning your wheels and going nowhere—and also burning valuable fuel in the process. What’s more, harboring maritime critters on your props can pose a serious threat to delicate ecosystems by spreading alien species.
Having been plagued by barnacles and other intrusive organisms for generations, the sailing community has brought the full breadth of its considerable inventiveness to bear on this sticky problem. You’ll hear barroom tales of the efficacy of potions of waterproof grease mixed with cayenne pepper, tetracycline and even quinine powder; some swear that rubbing a black magic marker onto the propeller blades keeps growth away; and others hold forth about the growth-repellent properties of lanolin. All of these, according to the anecdote, have worked for some sailors in some waters at least some of the time. Just as with any bottom paint, though, there are many variables affecting the way your prop potions work—temperature, salinity, vessel movement, currents, sunlight.
And therein lies the twofold problem with propeller fouling. There is no clear consensus as to what works best in any given scenario, and even if something does work, how well will it adhere to a spinning propeller? Many different approaches have been tried: here are some of them. [links]
From the moment we left the mooring, I knew what was wrong. The boat had sat, hardly used, for nearly a month; now, as I opened the throttle, the engine note changed to a complaining rattle, black smoke belched from the exhaust, and the boat moved reluctantly off as if tethered to the bottom by an elastic band. From past experience, I knew the propeller was covered in barnacles. The only bright note was that it was late October and we were taking the boat to be hauled out, so there would be no plunging into frigid New England waters to scrape the growth off the prop. here
The problem of keeping your prop barnacle-free is by no means restricted to the Northeast. From the Florida Keys to the Bering Strait, those pesky arthropods alight gleefully upon your running gear and settle down for the long haul. And in another example of life’s little injustices, they affect us sailors more than they do powerboaters. The more you use your engine, the less likely you are to have your prop colonized by barnacles.
There are a few options for keeping growth off your propellers and running gear and we will explore advantages and disadvantages for applying various coatings to your propellers and running gear. Keep in mind that when you paint props and running gear they are under extreme conditions with speed, cavitation, electrolysis and environmental conditions ( like running through sand or hitting ground or objects). These can cause the same result as sandblasting your running gear – something you will want to avoid after you choose a coating!
Basic Steps [links]
Applying bottom paint to your underwater gear is a little tricky because there are additional steps that must be taken before applying the bottom paint. Especially if you have a fiberglass boat. Most bottom paints contain copper that act as a biocide and prevent growth. However, when applying bottom paint (with copper) to metal, you create a battery effect with the metal on metal. This leads to electrolysis and pitting of your props and running gear. Follow these basic steps before going with this option here