UV Absorbers soak up detrimental UV rays from sunlight, converting them into heat, which is then dissipated through the surface of the coating (1). Hindered Amine Light Stabilizers (HALS) do not absorb radiation; instead they protect the coating resin from the harmful effect of photochemically-produced ‘free radicals’ by neutralizing them, hindering chemical degradation. HALS regenerate themselves during the neutralization process, so go on providing protection throughout the lifetime of the coating (2-4).