Paper-based artworks are prone to natural aging processes driven by chemical and biological mechanisms. Numerous cleaning, disinfecting, and protective treatments have been developed to mitigate deterioration and prevent irreversible damage. In this context, the application of hydrogels as support materials has gained widespread attention due to their efficacy in enabling minimally invasive treatments. In the present study, we investigated the use of poly(acrylic acid)/TiO₂ composite hydrogels both as cleaning agents and protective coatings to shield paper from the detrimental effects of ultraviolet (UV) radiation. To evaluate the efficacy of these treatments, we employed a diagnostic protocol previously developed to differentiate between hydrolytic and oxidative aging processes, based on Raman spectroscopy imaging. Our findings demonstrate that papers coated with poly(acrylic acid)/TiO₂ composite hydrogels exhibit enhanced stability and improved resistance to degradation compared to uncoated samples.