CoatingsPro Magazine Supplements

Concrete Dec 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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SPONSORED CONTENT 24 CONCRETE COVERED DECEMBER 2018 COATINGSPROMAG.COM Concrete Proof Concrete Proof continued from p. 21 working with concrete substrates can range from airless sprayers and pump-up sprayers all the way through to hand tools allowing more detailed precision, such as squeegees, brushes, rollers, and trowels. On many jobs, a material may be spread out over larger areas via a sprayer or squeegee, while smaller nooks and crannies could require the personal touch of a brush, roller, or spatula. Many materials include specifications on the technical data sheet regarding how to apply them and which tools can be used. In some cases, equipment alterations may need to be made to account for the unique needs and rules of individ- ual jobsites. " T he tools haven't changed much," said Ba l l of Sher w in-Wi l liams. " You might get a squeegee that 's a litt le d if ferent in ter ms of how it attaches to a f rame, but we've only rea l ly had minor changes in equipment for the most par t over the past 10 years. W hat has helped in some of these larger oppor tunities is using pumps as not necessar- i ly a way to apply the coating , but as a mechanism to get it f rom the mi x ing station to the f loor. It 's just much faster and ef f icient as an apparatus to get it to the f loor. You're using pumps not necessar i ly to spray it, but to get it f rom point A to point B and then spread it. So instead of hav ing a person car r y a 5 -ga l lon [18.9 L] bucket at a time, you're pumping ga l lons per minute out of a pump. T hat elimi- nates a r unner." Companies specializing in hand tools that can be used for concrete substrates include Purdy, e Brush Man, and Seymour Midwest through its Midwest Rake brand. Besides hand tools, other related items that could be of use on concrete application projects are brooms, gauge rakes, roller covers, and frames to spiked shoes worn during application. Identify and Inspect Before leaving the jobsite, contractors should take time to inspect their work and ensure the application went according to specifications. Several instrumentation providers offer tools to assist in this process, including DeFelsko, Elcometer, Gardco, and more. Many of these inspection tools include probes to measure various coating parameters, such as thickness, profile, environmental conditions, shore hardness, salt contamination, and wall thickness. DeFelsko's PosiTector gage body is a product that universally accepts all Positector 6000, 200, RTR (replica tape reader), SPG (surface profile gage), DPM (dew point meter), SST (soluble salt tester), SHD (shore hardness durometer), and UTG (ultrasonic thickness gage) probes, and it easily converts from a coating thickness gage to the other measurements. Meanwhile, the Elcometer 500 Coating ickness Gauge accurately measures dry film thickness (DFT) on concrete and other cementitious substrates of up to 10 mm (0.4 inches). Users simply select the coating material and start measuring, with no need to set up gates or range values or know the thick- ness of the coating. DeFelsko also offers a "quality control " guide for concrete substrates, in which it offers tips on various inspection tests that may need to be conducted throughout a project — not merely at the end. Recommendations include the use of handheld, electronic devices to measure and record applica- ble environmental conditions; ultrasonic coating thickness gages to measure coating thickness; portable pull-off adhesion testers to measure the force required to pull a specified area of coating away from its substrate; and low-voltage pinhole detec- tors to locate any pinholes, holidays, and cracks that might compro- mise the coating system's continuity. "In many cases, the lack of a comprehensive quality control procedure is at the root of coating failures," said David Beamish, president of DeFelsko. "As with other build- ing materials, applying coatings to concrete requires specific measures to ensure coating performance and longevity." Cementing Contracts Concrete might be the most commonly encountered substrate for coatings contractors, with its widespread use presenting project opportunities from floors to roofs, and sometimes beyond. Concrete's versatility, though, can also bring additional hurdles, considering potential variance in the quality, composition, and conditions at each jobsite. If coving is required on a concrete floor, there are several companies in the industry, such as Easycove, that offer ready-made options for ease of application. In addition to being able to test for surface p r o f i le s , d e w p o i n t , a n d s o l u b le s a lt , DeFelsko's tools, for example, test thickness. Concrete Proof continued on p. 42

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