Boat Maintenance

There are two schools of thought when it comes to applying antifouling to Hypalon. Were of the "don't do it" camp for a few reasons. First, once bottom paint is applied to Hypalon, it can be very difficult to remove without risking damage to the material. Second, if you ever store the dinghy on deck or deflate it for longer storage, you can be sure that paint is going to rub off on things youd rather it not foul-for instance, tacking headsails or the deck, if the dinghy is stored there. Even if you leave the dinghy in the water for long periods of time without use, cleaning the bottom regularly should be sufficient. The folks at Mercury agree with us on this point. Mercury Marine Sales Manager Larry Piechocki told Practical Sailor, "Once this paint is on the tubes, it will never come off. Im not a big fan of painting inflatables, but that is up to the customer."

David Boye, the Arizona knifemaker whose unique folding boat knife of cast dendritic cobalt won our June 2000 sailors knives bench test and was a reference standard for our March 2004 revisit, recently introduced a new model Basic 3 Cobalt knife. These knives doggedly retain a cutting edge when going through tough, blade-resistant materials like rope, cardboard, or even old rugs. Others give up long before the job is done. In our experience, Boyes cobalt knives last much longer-and when they finally do slow down, they can be resharpened with just a few strokes on a medium stone. The difference, we reason, is in the metallurgy. Boyes cobalt blades are "cast to shape and retain the pristine crystal network of highly dendritic (branching) bonded carbide throughout the blade, which aids in cutting and maintaining the structure of the cutting edge," according to the maker. Most knives are from steel that originally contained a similar crystal microstructure, but then underwent rolling, stamping, or forging to shape. This process breaks down the original carbide microstructure of the metal. The carbides at the edge are then no longer rooted into the overall microstructure. Complex heat treatment is then applied to develop properties such as hardness and toughness.

Since the introduction of ethanol fuels at dockside pumps, weve had a slew of reader inquires about the effects of E-10 on fuel lines, fuel tanks, two-stroke engines, and four-stroke engines. We recently tested some products designed to address these issues, specifically those that claim to combat the problems associated with phase separation in E-10. Practical Sailor tested: E-Zorb from Marine Development Research Corp. (MDR), Sta-bil Marine Formula Ethanol Treatment from Gold Eagle, PRI-G from Power Research Inc., Star Tron from Star brite, and Techron from Chevron. The claims of each product varied, but the test products fell into one of these general categories: conventional fuel storage additives, ethanol fuel storage additives, and restorative gas additives. Our tests looked at whether the additive itself would leave ash deposits, gum deposits, or residue that might cause contaminated lubrication oil; whether an additive had a tendency to emulsify, suspend, or absorb free water; and whether the additives could delay the onset of cooling-induced phase separation.

Seven caulks were applied to teak-deck seams in June 2006. At that time Practical Sailor looked at ease of application, adhesion, durability, and resistance to chemicals. Updates in the September 2006 and March 2007 issues looked at pliability, durability, and adhesion. This update tests caulks for long-term durability and resistance to chemicals. A 4-inch bead of each teak caulk that was applied two years ago to 16 different panels was doused regularly with chemicals that teak decks are likely to be exposed to (motor oil, acetone, nleach, etc.). The test group is a mix of polysulfide, polyether, silyl modified polymer (SMP), and silicone-based products. Seven products were tested: Boatlife Life Caulk; BoatLIFE Teak Deck Sealant; BoatLIFE Type P; Bostik/Simson MSR; Teakdecking Systems; MARITIME Teak Deck Caulk, and West Marine Multi-Caulk.

In addition to our annual paint-panel tests, Practical Sailor has a host of ongoing head-to-head field tests of the top-performing antifouling paints. Our test-boat fleet allows us to evaluate paints in real-world conditions on boats that run the gamut in terms of usage, storage, and cruising grounds. For the head-to-head tests, each boat’s hull below the waterline is divided into four equal sections (two per side). One paint is applied to the port bow and starboard aft section, while another is painted onto the starboard bow and port after section, giving both paints equal exposure. Paints are applied following maker’s instructions, and an extra coat is applied at the waterline.

Our two-year test wraps up with 20 top-rated paints. Unlike the last two-year results when hard paints dominated, the group is split with 10 self-polishing or ablative paints and 10 hard paints. Our Recommended, Best Choice, and Budget Buy picks also are divided pretty evenly. In past rating cycles for this panel set (October 2007 and March 2008), Interlux Micron 66 and Sea Hawk Biocop TF were named top picks. These two still lead the pack at the two-year mark. Both are expensive, with Micron 66 costing $220 per gallon and Biocop TF ringing in at $228 per gallon. They also both use zinc pyrithione as an anti-slime agent. Our top bright-color paint after two years in the water is Blue Water Kolor-another expensive paint, priced at $170 per gallon. The top-performing two-year paint suitable for race boats is Interluxs VC Offshore. Pettit Trinidad SR, well polished, would also be a good choice for racing.

Looking for the best marine antifoulant to keep your hull clean? Check out Practical Sailors semi-annual bottom paint test report, which offers performance ratings on nearly 80 marine antifouling paints. Multiple sets of submerged fiberglass test panels-two in the Florida Keys and two in Long Island Sound-were pulled and examined for their resistance to hard growth and soft growth. Detailed charts show the results of the one-year and two-year tests for ablative paints, hard paints, and specialty paints (white paints, eco-friendly paints, bright paints, water-based paints, and racing boat paints). After the ratings were logged, testers retired the two-year panels to make room for the 2008 bottom paints. This lineup-72 paints in all-includes several low-copper paints and no-copper paints, which are becoming increasingly popular as sailors look for viable alternatives to metal-based paints. Paint manufacturers and distributors participating in the test include Blue Water Marine Paint; Donovan Marine; Epaint Co.; Flexdel Aquagard; Interlux Yacht Finishes; Kop-Coat; Pettit; New Nautical Coatings; Seahawk Paints; West Marine; and Boaters World (Seabowld). Among the top-rated paints are Interlux Micron 66, Interlux Super Ablative, Pettit Ultima SR, Pettit Trinidad SR, Pettit Unepoxy Plus, Pettit Vivid, and Sea Hawk Biocop TF.

According to German toolmaker Wera Tools, much of the corrosion we find in the cross-hairs of our Phillips-head and other stainless-steel fasteners is a result of cross-contamination during the tightening process when traditional, carbon-steel tools are used to secure the fastener. Small bits of the carbon steel are embedded in the fastener, and the particles form galvanic cells that quickly corrode or leave a pit. Solution? Stainless steel tools-the logic being that using stainless on stainless, there will not be any contact corrosion, and therefore no rust.

Practical Sailor testers are constantly schlepping tools between the Practical Sailor workshop, our own garages, and—of course—our boats. So we’re always on the lookout for a toolbag that makes said schlepping a little easier. Enter the Original Nantucket Diddy Bag, which we came across at a recent boat show. It is the first tool bag we’ve seen that is reversible and convertible. Designed by a Nantucket carpenter, the bag’s well-thought-out design is practical and versatile. With 36 various-sized pockets (including a hidden one in the bottom), the bag makes tools easy to find and keep organized—no more digging to the depths of a cluttered tool bag.

Your recent assessment of the locator service SPOT (Practical Sailor September 2008) was spot on. We recently took it along on a Pacific Coast, offshore delivery of a 50-foot sailboat. We hit bad weather and had several mechanical failures. Our families ashore were able to follow our progress on the SPOT website throughout our trip. The problem came when a panicked crew, unknown to me, hit the "911" button. I was able to cancel the 911 call a few hours later. Our families were simply alerted that we had a serious problem but did not know anything more for a couple days. The SPOT command central repeatedly called my cell phone, which was with me, 250 miles offshore and obviously out of range. They claimed they could not determine our position despite several days of track records.