A coating composition comprising: a. a microencapsulated biocide comprising an isothiazolone biocide as a core material encapsulated in a wall material, wherein less than 20 percent of the encapsulated biocide is released when contacted with xylene for a period of 90 days at 45°C and from which water can leach the biocide from the wall material; b. free isothiazolone biocide; c. a film forming polymer or binder solids; and d. one or more solvents; wherein the water solubility of the isothiazolone biocide is less than 2 percent at room temperature; wherein the concentration of free isothiazolone biocide is from 0.25 percent to 15 percent of the weight of the film forming polymer or binder solids; wherein the amount of free and microencapsulated isothiazolone biocide is a total of 1.5 percent to 30 percent by weight of the composition; and wherein the isothiazolone biocide is encapsulated in: i) a microcapsule having a wall that is formed from a hydrolyzed polyvinyl acetate and phenolic resin; ii) an amino-urea-formaldehyde shell system; iii) a dual walled capsule, wherein said dual walled capsule comprises: a first interfacial capsule wall of acrylic polymer and a second wall of polyvinyl acetate-urea-resorcinol-glutaraldehyde; or a first interfacial capsule wall of acrylic polymer and a second wall of polyvinyl acetate-urea-resorcinol-formaldehyde; iv) a microcapsule having a wall that is formed from: a melamine-formaldehyde shell capsule further re-encapsulated with polyvinyl acetate-urea-resorcinol-formaldehyde; a melamine-formaldehyde shell capsule re-encapsulated with polyvinyl acetate-urea-resorcinol-glutaraldehyde polymer; a polyvinyl acetate-urea-resorcinol-glutaraldehyde shell capsulate re-encapsulated with a melamine-formaldehyde process; a hydrophilic shell comprising gelatin-gum arabic as a first shell and a second shell of melamine-formaldehyde or a urea-resorcinol-formaldehyde condensation polymer; v) a melamine-formaldehyde wall having a thickness of less than 0.1 micron, and then further encapsulated in a polyvinyl acetate wall. a. a microencapsulated biocide comprising an isothiazolone biocide as a core material encapsulated in a wall material, wherein less than 20 percent of the encapsulated biocide is released when contacted with xylene for a period of 90 days at 45°C and from which water can leach the biocide from the wall material; b. free isothiazolone biocide; c. a film forming polymer or binder solids; and d. one or more solvents; i) a microcapsule having a wall that is formed from a hydrolyzed polyvinyl acetate and phenolic resin; ii) an amino-urea-formaldehyde shell system; iii) a dual walled capsule, wherein said dual walled capsule comprises: a first interfacial capsule wall of acrylic polymer and a second wall of polyvinyl acetate-urea-resorcinol-glutaraldehyde; or a first interfacial capsule wall of acrylic polymer and a second wall of polyvinyl acetate-urea-resorcinol-formaldehyde; iv) a microcapsule having a wall that is formed from: a melamine-formaldehyde shell capsule further re-encapsulated with polyvinyl acetate-urea-resorcinol-formaldehyde; a melamine-formaldehyde shell capsule re-encapsulated with polyvinyl acetate-urea-resorcinol-glutaraldehyde polymer; a polyvinyl acetate-urea-resorcinol-glutaraldehyde shell capsulate re-encapsulated with a melamine-formaldehyde process; a hydrophilic shell comprising gelatin-gum arabic as a first shell and a second shell of melamine-formaldehyde or a urea-resorcinol-formaldehyde condensation polymer; v) a melamine-formaldehyde wall having a thickness of less than 0.1 micron, and then further encapsulated in a polyvinyl acetate wall.