PPG Industries’ protective and marine coatings (PMC) business is celebrating the 20th anniversary of polysiloxane coatings, for which PPG was granted the first patent on Jan. 4, 1994. Tim Knavish, PPG vice president, protective and marine coatings, said polysiloxane coatings have revolutionized the protective and marine coatings industry, expanding into applications such as civil infrastructure, original equipment manufacturers (OEMs), government, water and wastewater, petrochemical, offshore, rail, power generation and wind energy.