TECHNOLOGY FOCUS - POLYMERS - Preferred Fluoropolymer Coating Composition: The aqueous liquid medium is basic. The fluoropolymer coating composition further comprises inorganic oxide nanoparticles, where the inorganic oxide nanoparticles comprise silica, clay, or their mixture. The inorganic oxide nanoparticles have an average particle size of less than 100 nm. The aziridine compound has the general structure (I).R=core moiety having a valency of Y;L=a bond, a divalent atom, or a divalent linking group;R1 to R4=hydrogen or a C1-C4 alkyl; andY'=2-6.The R-L is a residue of a multi(meth)acrylate compound. The aziridine compound is free of hydrolyzable groups, where the aziridine compound is free of ester groups. The aziridine compound has the general structure (II), where the sum of n+m is 3.R''=hydrogen or a C1-C4 alkyl;X=a bond, a divalent atom, or a divalent linking group;n=0, 1 or 2; andm=1, 2, or 3.The fluoropolymer comprises 15-50 mol.% of monomeric units derived from vinyl fluoride (VF), vinylidene fluoride (VDF) or their combination. The fluoropolymer comprises greater than or equal to 45 mol.% of monomeric units derived from tetrafluoroethylene (TFE). The fluoropolymer further comprises monomeric units derived from hexafluoropropylene (HFP). The fluoropolymer comprises greater than or equal to 50-70 mol.% of monomeric units derived from TFE and repeat units derived from alkyl vinyl ether. The fluoropolymer comprises greater than or equal to 45 mol.% of monomeric units derived from TFE and monomeric units derived from perfluoroalkyl vinyl ether. The fluoropolymer further comprises surfactants, pigments including titanium dioxide (TiO2), and light stabilizers. Preferred Article: The substrate in is an inorganic or organic substrate. Preferred Photovoltaic Module: The coating is a primer having a thickness of 0.1-1 mil. A fluoropolymer layer lacking fluoropolymer particles is disposed on the primer. The coating is a backside coating that is exposed on the outer surface layer having a thickness of 0.2-10 mils. EXAMPLE - No suitable example given.