NOVELTY - A liquid composition (C1) comprises at least one ultra violet (UV) oligomer contains at least one aliphatic urethane acrylic oligomer; acrylate diluent monomer selected from mono- and bi-functional reactive acrylate diluent monomer; and photo-initiator, where the liquid composition does not comprise solvent, adhesion promoter and isobornyl acrylate monomer or the liquid composition comprises a mixture of aliphatic urethane acrylic oligomer and UV oligomer that is not aliphatic urethane acrylic oligomer.    USE - For producing a coated surface and coated PV module. Also useful for coating substrates such as silicon dioxide substrate (claimed).    ADVANTAGE - The liquid composition has no or very low volatile organic contents. The liquid composition is environmentally friendly; reduces operational costs and they do not need solvent abatement equipment to remove solvent. The composition provides good adhesion to SiOx, high dielectric insulation strength, toughness and flexibility at low temperature, scratch resistance (i.e. mechanical hardness), UV resistance, weathering resistance and flame resistance; also provides durable protection conformal coatings for thin film PV modules, where the conformal coatings exhibit very good insulating properties; and thus prevent leak current for the PV module.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a liquid base coat composition (C2) comprising at least one UV oligomer containing aliphatic urethane acrylic oligomer; acrylate diluent monomer selected from mono- and bi-functional reactive acrylate diluent monomer; photo-initiator; and leveling agent, where the liquid composition does not comprise solvent and adhesion promoter;    (2) a liquid top coat composition (C3) comprising UV oligomer containing aliphatic urethane acrylic oligomer; acrylate diluent monomer selected from mono- and bi-functional reactive acrylate diluent monomer; photo-initiator comprising benzophenone; non conductive pigment; nonionic slippery agent; nonionic UV absorber; hindered amine light stabilizer; and nonionic antioxidant, where the liquid top coat composition does not comprise a solvent and adhesion promoter;    (3) producing (M1) a coated surface involving providing substrate surface; applying liquid primer coat composition comprising silane adhesion promoter to the substrate surface to produce primed surface; applying liquid base coat composition (C2) to the primed surface to produce a base coated surface; and applying liquid top coat composition (C3) to produce the coated surface, where each of the base coat composition and top coat composition do not comprise a solvent and do not comprise an adhesion promoter;    (4) producing (M2) coated photovoltaic (PV) module involving providing PV module surface; applying primer coating composition comprising silane adhesion promoter to the PV module surface to produce primed surface; applying the liquid base coat composition (C2) to the primed surface, to produce base coated surface; and applying the liquid top coat composition (C3) onto the base coated surface to produce the coated PV module, where each of the base coat composition and the top coat composition do not comprise solvent and an adhesion promoter;    (5) coated PV module comprising a PV module having a surface, primer coat comprising liquid silane adhesion promoter provided on the surface to produce primed surface; the base coat (C2) provided on the primed surface, to produce a base coated surface; and a top coat (C3) provided on the base coated surface to produce the coated PV module, where each of the base coat and the top coat do not comprise an adhesion promoter; and    (6) a coating system comprising the liquid primer coat composition (C1); the liquid base coat composition (C2); and the liquid top coat composition (C3), where each of the base coat composition and the top coat composition do not comprise a solvent and adhesion promoter.