Cleaning Oil off of Gelcoat
When the Cosco Busan slammed into the Oakland-San Francisco Bay Bridge spilling thousands of gallons of oil into the Bay in November, 2007, a lot of boat¹s gel-coats were affected. Brendan Schmidt, a marine surveyor in the Bay area, handled a claim on a sport fisherman that plowed through the spill, covering its deck, topsides and swim platform with heavy oil deposits. To clean the mess, San Francisco Boatworks used something called Dyna-Tar, a citrus-based cleaner made by Aldren Chemical ([650]-347-8242). Most of the oil was removed with the cleaner; only a few stubborn stains required polishing. The key was to apply the product as quickly as possible; the longer oil is on gelcoat, the more difficult it will be to remove.
Oil Spill Cleanup Tips For Boaters From Interlux®, Coopercoat and Awlgrip®
Tech Hotlines Also Open Interlux 800.468.7589 Awlgrip 888.355.3090
UNION, NEW JERSEY (USA) – In the wake of what could be the largest oil spill in US history, leading yacht paint manufacturers Interlux and Awlgrip offer boaters in the impacted areas the following tips to help clean contaminated boats.
INTERLUX GUIDELINES: TREATMENT OF ANTIFOULING CONTAMINATED WITH OIL
The surface of an antifouling paint that has become contaminated with oil can become “blocked” i.e preventing the biocide from being released, which subsequently leads to premature fouling. It will also result in a contaminated layer that will make adhesion of new antifouling applications difficult.
Cleaning of contaminated antifouling surfaces:
For hard polishing and ablative antifouling paints that have been heavily contaminated the best method to use when treating the bottom is to use a paint-stripper such as Interstrip 299e to remove all the pollution and the paint, then scrub the substrate using Fiberglass Surface Prep YMA601 and a coarse Scotch-Brite pad. Rinse with fresh water. Repeat until the surface is clean (when the water cascades off of the surface with no beading or separating). Allow the surface to dry thoroughly prior to re-painting. The same process is recommended on metal boats however to avoid corrosion the metal substrate should be prepared by grinding or blasting after the cleaning process and prior to priming. To aid adhesion apply InterProtect 2000E primer per label instructions.
Sanding or sand blasting a surface that still has oil on it may drive the oil into the surface and cause a loss of adhesion of the subsequent coats.
If the coating of oil is light, powerwash and then use a household detergent with water to scrub off any pollution. Then scrub using Fiberglass Surface Prep YMA601 and a coarse Scotch-Brite pad and rinse thoroughly with fresh water. Let dry prior to re-painting. Polishing paints such as Micron Technology, may be re-launched without painting assuming the film thickness of remaining paint is adequate (2-3 mils dry after scrubbing) the next application is scheduled within 5 months.
From Coppercoat:
Coppercoat is offering its customers affected by the spill instructions for the removal of oil from the Coppercoat antifouling on the hull.
For lightly contaminated hulls: Use a good detergent (biodegradable is better) to wash the hull thoroughly to remove the oil residue. Use the best industry and regulatory practices for the catchment of the oil residue to ensure that no runoff enters the water. Once the hull is cleaned of oil, the Coppercoat-treated hull can be relaunched.
The Coppercoat will not have been damaged by the oil and there is no need to replace or recoat the Coppercoat.
For heavily contaminated hulls: Use a good detergent (biodegradable is better) to wash the hull using a good quality scrub brush to remove as much oil as possible. If the hull still has oil on it repeat the process until all of the oil is removed. Coppercoat is a water-based epoxy, so you can really scrub it hard if necessary without removing the Coppercoat that is protecting the hull.
Use the best industry and regulatory practices to catch and dispose of the oily residue. When the hull is clean of oil, return the boat to the water with no damage to the Coppercoat antifouling.
AWLGRIP GUIDELINES: TREATMENT OF TOPCOATS CONTAMINATED WITH OIL Cleaning of contaminated topcoat surfaces:
Contaminated topcoats should be cleaned as soon as practically possible to minimize the damaging effects of the crude. If the surface of a topcoat is contaminated with crude oil, staining and possible degradation of the topcoat may result from the acidic nature of the contaminant. The recommendations below apply to Awlgrip®, Awlcraft® 2000 and Interlux® Perfection topcoats. If there is any doubt of the type of surface in question always test a small area first.
In the case of heavy contamination, the material may be a thick, sticky tar-like material due to its exposure to the elements. It is recommended that these surfaces first be cleared by wipe down with T0016, T0170 or Mineral Spirits followed by power washing, and then cleaned with Awlwash® at a 4 oz/gallon level (or household liquid detergents such as Dawn). The detergent washing step of the cleaning process must be done in manageable areas. Each area should be then be thoroughly rinsed with plenty of clean water before moving on to the next. DO NOT allow detergent solutions to dry on the surface.
Hulls exhibiting ‘sheen’ contamination may be cleaned with the regular concentration levels of Awlwash, though they too may benefit from a prewash wipe down with T0016, T0170 or Mineral Spirits to loosen the film.
In both cases, it is recommended that the newly cleaned surface be protected from further contamination with application of Awlcare®.
IN ALL CASES:
Contaminated waste water should be collected per local marina guidelines, local authority regulations and/or Clean Water Act requirements. Collecting the water and the emulsified crude will prevent spreading of contamination. Crude and solvent contaminated wipes must also be disposed of in a responsible manner.
For further assistance, call Interlux Technical Service, 1+800.468.7589 or Awlgrip Technical Service, 1.888.355.3090. For more information about Interlux products, visit www.yachtpaint.com/usa .
For more information about Awlgrip products, visit www.awlgrip.com
Interlux and Awlgrip – 2270 Morris Avenue – Union NJ 07083 USA
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Product information release prepared by Home Port Marine Marketing. www.homeportmarine.com
