Formulation of PVC plastisol offers the possibility to create a wide range of films with different colors and surface aspects. This is of great interest for decorative automotive solutions. Yet the specifications required by automotive constructors for outdoor applications demand an ever stronger UV resistance. PVC is degraded in presence of any source of energy. Due to structure defects implying labile chlorine atoms on the PVC chain, a dehydrochlorination occurs by creating carbon-carbon double bonds and eliminating HCl. Then polyenes react by producing free radicals which undergo an oxidative chain reaction. These degradation mechanisms enhance yellowness of PVC films and a loss of mechanical properties[1]. Therefore, PVC formulation should include the best suitable UV stabilization system. Two main families of UV stabilizers for polymer matrices exist: ultraviolet absorbers (UVA) and hindered amine light stabilizers (HALS). UVA have a blocking effect on ultraviolet radiation, while HALS react with free radicals and thus inhibit the oxidative chain reaction[2]. The effects of a UVA, of a HALS and of the combination of both introduced at different rates were compared in a PVC plastisol. The UVA acts immediately by absorbing the major part of UV radiation which limits the film degradation. Conversely, the HALS seems to have any effect on the UV stabilization of PVC, moreover the combination of both UVA and HALS behaves like UVA alone. The tested HALS, by its base nature, is probably deactivated by acido-basic reaction with HCl and is not able anymore to inhibit the PVC oxidation. Whereas HALS act as the best UV stabilizers in many polymer matrices, they are not suitable in plasticized PVC. The use of a non-basic HALS (NOR-HALS) is currently studied in combination with the UVA[3]. [1]Wypych, PVC Degradation and Stabilisation, ChemTech Publishing, 2015, 167-203 [2]Chai et al., J Appl Polym Sci, 125, p. 3376-3384 [3]Capocci et al., J Vinyl Addit Techn, 11, p. 91-94