Described herein is a latex blend comprising (i) an amorphous perfluoropolymer and (ii) an aqueous dispersion of semi crystalline fluoropolymer particles, wherein the particles comprise a TFE homopolymer or a TFE copolymer comprising no more than 1 wt % of a second fluorinated monomer, wherein the semi crystalline fluoropolymer particles (a) have an MFI (372° C. with 2.16 kg) of less than 50 g/10 min or (b) are not melt processible and have an SSG of less than 2.190, wherein the semi crystalline fluoropolymer particles have an average diameter greater than 100 nm.