Experimental techniques have been developed to investigate the migration of UV absorbers and hindered amine light stabilizers taking place in acrylic/melamine clearcoats during cure. The basic approach consisted of microtoming the coatings into thin sections and measuring the concentration of each section. The stabilizer migration within single-layer coatings and between adjacent clearcoat layers was investigated. The effect of resin viscosity and layer swelling on the migration characteristics was studied. Stabilizer losses at the coating surface and migration into plastic substrates on cure were also determined.