On August 28, 2007, Sherwin Williams purchased Columbia Paint & Coatings. On July 6, 2011, Sherwin-Williams acquired Leighs Paints, based in Bolton UK, manufacturers of intumescent and high performance industrial coatings. In late 2012, Sherwin Williams began the process of purchasing the Comex Group. Comex was the 4th largest paint manufacturer in North America. After Mexican antitrust regulators voted against the deal twice, Sherwin-Williams bought Comex's US and Canadian divisions for $165 million on Sept 16, 2013. PPG, US-based paint and coating company, acquired Comex's Mexican division for $2. 3 billion.