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51 COATINGSPRO SEPTEMBER 2015 — f rom a f rea k ish ly cold weat her event t h at broug ht t he a rea a week 's wor t h of A nt a rc t ic temperat u res to v ibra - t ions em a n at i ng f rom a nea rby pa rk i ng st r uc t u re — but no one k new prec isely why t he conc rete sl ab wa s mov i ng. W it h new c rac k s poppi ng up a nd e x ist i ng c rac k s g row i ng l a rger by t he d ay, Gra nd R ac i ng & C a si no felt a s t houg h its h a nd wa s bei ng forced. He y! It 's a lways a ga mble to f i x a problem when you don't k now t he c au se. But now t he t ables were t u r ned. T he c a si no needed to rol l t he d ice w it hout hou se adva nt age! Cover the Bet Even without a frm diagnosis in hand, Desco knew they needed to cover the casino's bet. Reasor huddled with Key Resin Company fooring specialist Jim Porter to come up with a sure-fre way to tame the cracks. "We had to somehow isolate the substrate cracks to prevent them from transferring back up through the coating system — no matter what," said Reasor. "We proposed beginning with Key Resin's 580 Flexible Membrane." Key #580 is a liquid-applied, urethane-mod if ied epox y that resists crack ing caused by hor izonta l substrate movement, accord ing to the company's product data sheet. T he t wo -par t mater ia l is blended at slow speeds, poured, and spread w ith notched squeegees or trowels to achieve approx imately 40 mi ls (1,016.0 microns) dr y f i lm thick ness (DFT ) in a single lif t. T he plan was to top the 580 w ith t wo trowel-and-rol l lif ts of Key #511 Epox y Binder/Gla ze, tota l- ing approx imately 40 mi ls (1,016.0 microns) DFT. T he 511 wou ld then receive a single d ip -and-rol l pass of Key #467-HS Urethane Topcoat at 3 –5 mi ls (76.2–127.0 microns) DFT to prov ide chemica l and wear resistance. With more than 2,200 slot machines raking in the dough, 24 hours a day, 7 days a week, the stakes couldn't get much higher.