CoatingsPro Magazine

MAR 2015

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 41 of 90

COATINGSPRO MARCH 2015 41 "She was decommissioned from the Nav y in 1970 and sat in mothballs for a while, then was donated to South Carolina in 1975 to be part of the museum," Howard said. "She's been open to the public ever since — 364 days a year. She gets about 300,000 visitors a year. People love coming to visit." (Te only day they're closed is Christmas.) But while the USS Yorktown's history is what makes it special, it also means the vessel has seen a lot of wear and tear. And as its time at the museum accumulated, Howard became more and more aware that the ship would need a recoat. "We've known for some time that she needed to be painted, but that comes with a lot of challenges," Howard said. "Because of the ship's age, she has a lot of old coating systems on her and is coated with lead. Tat makes it more difcult to do the job, especially over water." Tat's because there are tight restrictions about how the museum must get rid of the old coating to make sure none of it pollutes the water below. And the environment wasn't the only hurdle on this job. Because the recoating of the hull was to be completed over water, the museum's crew first needed to figure out how to adhere to environmental regulations for removing the old and applying the new coatings. The crew started by scraping off the many old layers, flakes, and blisters, of paint using a dull paint scraper. The two- to four-person crew carefully collected and disposed of the waste. JOB AT A GLANCE PROJECT: Recoat the hull of a World War II aircraft carrier called the USS Yorktown in South Carolina COATINGS CONTRACTOR: Patriots Point Naval & Maritime Museum 40 Patriots Point Rd. Mount Pleasant, SC 29464 (843) 884-2727 SIZE OF CREW: 2–4 people PRIME CLIENT: State of South Carolina 1301 Gervais St., Suite 710 Columbia, SC 29201 (803) 771-0131 SUBSTRATE: Carbon steel CONDITION OF SUBSTRATE: Used; covered by as many as 8 layers of various coatings applied over several decades SIZE OF JOB: 50,000 sq. ft. (4,645 m²) DURATION: 2 years UNUSUAL FACTORS/CHALLENGES: » Environmental regulations meant old paint had to be carefully scraped off and collected » Working for a nonprofit museum meant budget was limited » The substrate was historic, so it wasn't known what was in each layer of coating » All work was done outdoors, so weather conditions had to be considered MATERIALS/PROCESSES: » Carefully scraped off old paint using a dull paint scraper; the material is collected and disposed of as hazardous waste » Worked on a man lift to access the curved exterior » Used CHLOR*RID to clean the surface » Applied Rust-Oleum's ROC Prime 100 primer at an average wet film thickness (WFT) of 2–4 mils (51–102 microns) » Rolled on two coats of Rust-Oleum's Sierra Performance MetalMax, a water-borne acrylic, to reach a total average WFT of 2–4 mils (51–102 microns) SAFETY CONSIDERATIONS: » Wore life jackets and harnesses at all times when they were over water and on the lift » Wore face shields, safety goggles, and gloves during the preparation process and painting

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