A coating composition comprised of: a) a semi-crystalline fluorinated polymer in the form of particles having an MV particle size of not more than 5 μm (microns), the MV value being the volume average particle size, wherein the volume distribution is determined using the Mie or modified Mie calculations, said MV particle size being measured using a Microtrac S3500 particle size analyzer; b) a nucleating agent; and c) optionally, an acrylic polymer, wherein the semi-crystalline fluorinated polymer is a homopolymer of vinylidene difluoride or a copolymer of vinylidene difluoride and at least one comonomer selected from the group consisting of fluorinated ethylenic monomers, non-fluorinated ethylenic monomers and non-fluorinated dienes, wherein said particles are a milled powder, wherein the nucleating agent is in the form of particles having an MV particle size of not more than 5 μm (microns), the MV value being the volume average particle size, wherein the volume distribution is determined using the Mie or modified Mie calculations, said MV particle size being measured using a Microtrac S3500 particle size analyzer, according to the procedure set out in the description, and wherein the nucleating agent is a tetrafluoroethylene homopolymer or a copolymer of tetrafluoroethylene and at least one fluorinated ethylenic monomer. a) a semi-crystalline fluorinated polymer in the form of particles having an MV particle size of not more than 5 μm (microns), the MV value being the volume average particle size, wherein the volume distribution is determined using the Mie or modified Mie calculations, said MV particle size being measured using a Microtrac S3500 particle size analyzer; b) a nucleating agent; and c) optionally, an acrylic polymer, wherein the semi-crystalline fluorinated polymer is a homopolymer of vinylidene difluoride or a copolymer of vinylidene difluoride and at least one comonomer selected from the group consisting of fluorinated ethylenic monomers, non-fluorinated ethylenic monomers and non-fluorinated dienes, wherein said particles are a milled powder, wherein the nucleating agent is in the form of particles having an MV particle size of not more than 5 μm (microns), the MV value being the volume average particle size, wherein the volume distribution is determined using the Mie or modified Mie calculations, said MV particle size being measured using a Microtrac S3500 particle size analyzer, according to the procedure set out in the description, and wherein the nucleating agent is a tetrafluoroethylene homopolymer or a copolymer of tetrafluoroethylene and at least one fluorinated ethylenic monomer. wherein the semi-crystalline fluorinated polymer is a homopolymer of vinylidene difluoride or a copolymer of vinylidene difluoride and at least one comonomer selected from the group consisting of fluorinated ethylenic monomers, non-fluorinated ethylenic monomers and non-fluorinated dienes, wherein said particles are a milled powder, wherein the nucleating agent is in the form of particles having an MV particle size of not more than 5 μm (microns), the MV value being the volume average particle size, wherein the volume distribution is determined using the Mie or modified Mie calculations, said MV particle size being measured using a Microtrac S3500 particle size analyzer, according to the procedure set out in the description, and wherein the nucleating agent is a tetrafluoroethylene homopolymer or a copolymer of tetrafluoroethylene and at least one fluorinated ethylenic monomer.