CoatingsPro Magazine

JAN 2018

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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COATINGSPRO JANUARY 2018 77 of the hangars were well within this limit," said Gierlich. at means that the material can withstand 20 pounds (9.1 kg) of drive per 1,000 square feet (92.9 m²) per 24 hours. e crew used squeegees to apply the AC Tech 2170 and then back rolled the material. "e product went on at a rate of 50 square feet per gallon [4.6 m² per 3.8 L]. It was applied at a thickness of 12 wet mils [304.8 microns]," said Kelly. According to both him and Gierlich, one of the biggest challenges on the job was gauging the AC Tech 2170 penetration rate. "W hen concrete is opened up as much as this substrate was, it's hard to truly know the coverage rate before you start. Luckily, our estimates were right on the money, and the 12 wet mil [304.8 microns] thickness was achieved [on average]," stated Gierlich. e team also flooded all joints in the concrete with the AC Tech 2170 to mitigate any moisture issues that might occur in these areas. All Systems Go Once the AC Tech 2170 had cured overnight, the crew was ready to install the Tnemec 210 Even Flow SL system. is aggregate-filled modified polyamine epoxy provides protection against various acids, alkalis, and abrasions, and it is easy to maintain. e Sunbelt team applied the Tnemec 210 epoxy with a notched squeegee at a thickness of 60‒70 wet mils (1,524.0‒1,778.0 microns). "ere were some gouges in the floor that we think were made by the equipment of the previous contractor. In these low spots, the 210 was installed at a higher build to even out the substrate and create a smooth and even finish," said Gierlich. With the application of the Tnemec 210 complete, the Sunbelt crew then applied the Tnemec 248 urethane topcoat. is aliphatic moisture-cured urethane has excellent resistance to abrasion, wet conditions, corrosive fumes, and chemical contact. "It also has great UV [ultraviolet] resistance. is is important in the hangars because the large doors are often open and exposed to a great deal of sunlight," said Kelly. e team applied this topcoat at an average thickness of 3 wet mils (76.2 microns) using a dip and roll technique. Using mostly 3M products, the crew remained safe by wearing hard hats, safety glasses, gloves, boots, and respira- tors with charcoal dust filters. During the surface preparation process, the Sunbelt Flooring team also wore ear protection. The Plan for Success According to both Kelly and Gierlich, the reason the third time was the charm for this project was due to extensive planning, excellent products, and skilled applicators. Over the course of the 20 days that the crew spent on the job, great attention was paid to every detail. "e biggest thing we learned from this job was just how important planning and preparation were to each and every job. Without a comprehensive plan, failure is much more likely," said Kelly. One of the largest planning considerations for the crew was performing a mockup in one of the most challenging areas of one of the hangars. "In a rehab situation like this, where there had already been two coatings failures, performing a mockup was vital. We mocked-up a section near the trench drain that stretches down 60‒70 percent of the building. We tied into joints and the trench drain. is way, we were able to foresee any challenges in these areas, as well as get a good gauge of coverage rates," explained Kelly. Gierlich concurred. "With the previous coating system, there had been a great deal of peel-up around the joints and the trench drain. ere is so much vehicle traffic, including the jets, the tow carts that bring the helicop- ters into the hangar, and automobiles, making sure the joints and the trench drain are not going to experience coatings failure was a huge concern on the job," said Gierlich. Fortunately for the Sunbelt Flooring team, all the planning and hard work paid off. e San Bernardino Sheriff 's Department Aviation Division is now able to house all its aircraft in one central location: a facility with durable, functional, easy-to-maintain, and beautifully protected concrete floors. CP Throughout the projec t, the crew wore hard hat s , s afet y gla s se s , g lo v e s , b o o t s , a n d r e s p i r ato r s w i t h c h a r co a l d u s t f i lte r s w h e n necessar y. Most of the gear came from 3M, according to Sunbelt's Operations Manager Chris Kelly. "The biggest thing we learned from this job was just how impor tant planning and p rep aration were to each and ever y job. Without a comprehensive plan, failure is much more likely," said Kelly. Epoxy for Hangars

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