Your 3D model with UV maps appears too shiny in Substance typically due to overly reflective material settings (high metallic/specular or low roughness) or UV-related texture issues (stretched/tiled textures amplifying shine).
Shine is controlled by material properties: Metallic adds metal-like reflection, specular boosts non-metallic gloss, and roughness (lower values = shinier) scatters light less. Misconfigured sliders often cause excess gloss.
UV problems like stretched unwraps can also exaggerate shine—distorted texture areas highlight reflectivity unevenly.
Fix it by first adjusting material settings (lower metallic/specular, increase roughness). If that doesn’t work, use Substance’s UV editor to flatten and scale UVs uniformly for consistent texture and shine.