Despite the increasing number of WB coatings and
the importance of proper light stabilization studies, a
comparative evaluation of the performance of different
UVA types and classes for WB systems was still
missing. In this article, the influence on coating properties
as well as long-term weathering performance of
different organic (BTZ and HPT) and inorganic MS
(TiO2, ZnO, CeO2) is discussed. The tested organic
UVA and inorganic MS are all commercially available
and described in Table 1. The molecular structures of
the organic UVA are shown in Fig. 1.