Which papers work with spot UV or UV printing, and is pearlescent paper OK?

Not by default. On smooth, non-absorbent surfaces UV ink adhesion has to be checked, and fast curing can change the look of pearl or metallic surfaces. VANGLAM applies UV only to stocks confirmed by a project-specific proof. Run tape-adhesion and scratch tests, confirm cure energy, and start with spot-UV samples on HALO or GLAZE for comparison.