The Solar Cell Laboratory from the Instituto Tecnológico y de Energías Renovables (ITER), with the support of the University of La Laguna (ULL), has been working from 2015 on the development of screen printing inks for the metallization of perovskite solar cells as an low-cost alternative to thermal evaporation [1-5]. Since 2019, efforts have also been devoted in the laboratory in order to find solutions for encapsulating perovskite solar cells and study their subsequent degradation due to exposure. In these trials, the chosen encapsulating material was ethylene-vinyl acetate (EVA), in the form of commercial sheets, which were applied by techniques similar the ones commonly used for laminating PV modules . EVA is a copolymer of ethylene and vinyl acetate, which is processed as a thermoplastics material. Also, it is a material that is soluble in aliphatic, aromatic and chlorinated solvents . On the other hand, Toluene is an aromatic hydrocarbon that, due to its non-polar characteristics, has been extensively used for depositing thin perovskite layers via spin coating techniques [8-11]. Xing-Zhong Zhao et Al [12,13] developed a carbon-based Hole Conductor Free planar heterojunction perovskite solar cells, with declared power conversion efficiencies up to 13.52%, by using a commercial conductive carbon slurry that, after dried, was mixed with Chlorobenzene in order to produce a paste that then was deposited over the perovskite layers by using doctor blade techniques. Although the carbon slurry used in this work was a polyethylene terephthalate based screen printing ink, commercially produced by the Japanese company JUJO , other conductive carbon slurries, commonly used for producing electrodes of graphite and graphite with carbon black, employ PVDF , mixtures of Polyvinylidene fluoride (PVDF) and poly(methyl methacrylate) (PMMA) dissolved in N-Methyl-2-pyrrolidone (NMP) , dimethylformamide (DMF), dimethylacetamide (DMA), dimethyl sulfoxide (DMSO)  and even water .