Antimicrobial coating for erosive environments

A substrate which, in use, is subject to high wear or highly errosive conditions, said substrate having an antimicrobial coating which provides both immediate and long term antimicrobial bioefficacy despite the high wear or errosive conditions of use, said antimicrobial coating comprising a cured base coat coating composition and a cured top coat coating composition, each coating composition derived from a curable polymer composition containing an inorganic antimicrobial agent, wherein the cured polymer of the base coat is a non-hydrophilic material and the cured polymer of the top coat is either (a) a hydrophilic material having a water absorption at equilibrium of at least 2% by weight other than a polysaccharide or hyaluronan or (b) a non-hydrophilic material that is either (i) skin forming, provided that inorganic antimicrobial agent is in particle form and the thickness of the top coat is such that an adequate number of particles of the antimicrobial agent are not skinned over so as to preclude the presence at the surface of the top coat of an antimicrobially effective amount of the antimicrobial agent, or (ii) non skin forming with respect to the antimicrobial agent;

• wherein said inorganic antimicrobial agent is an antimicrobial metal or metal ion containing agent;
• wherein said cured non-hydrophlic base coat is thicker than and has long-term durability as compared to the top coat;
• and wherein the substrate is selected from the group consisting of floors, conveyer belts, appliances, chemical storage tanks, animal feed tanks, cooling water systems and pipes, storage containers, bulk storage containers, silos, and storage compartments of transport vessels, rail cars and vehicles.