It is common practice to combine hindered amine light stabilizers (HALS) with UV absorbers (UVA) for optimal protection of coatings and plastics. The ratio of UVA and HALS strongly depends on the concentration of pigments (acting as UVA) used in the paint; that is, a clearcoatings require higher amounts of UVA, whereas opaque pigmented coatings require higher amounts of HALS. Here, especially basic HALS types can interfere with paint components like, for example, pigments due to acid/base interactions. In this article, we want to discuss the influence of HALS basicity on long-term performance in opaque white pigmented solventborne (SB) and waterborne (WB) coatings for industrial applications in correlation to the quality of the used TiO 2 .

In recent years, the industry has succeeded in achieving adequate performance of coatings for automotive, industrial, and decorative applications, both in terms of mechanical and aesthetical properties. Nevertheless, there is an increasing demand for novel light stabilizers which can meet even today's higher performance and quality requirements as well as cost pressures. It is well known, for example in the automotive industry, that UV-absorbers (UVA) based on hydroxyphenyl-s-triazines (HPT) are capable of fulfilling these requirements where 2-(2-hydroxyphenyl)-benzotriazoles (BTZ) tend to fail or show inferior properties. Besides the well-known HPT for automotive applications, other high-performance products have been developed for an even broader range of applications comprising, for example, thin-or reducedfilm applications, powder coatings, and extremely durable wood coatings. New encapsulation techniques make it even possible to convert most of these hydrophobic products into highly compatible and stable water-based product forms. This opens the door for the advanced HPT UVA for a broad range of possible waterborne and solventborne applications.

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Photochemistry is an essential tool in both the manufacturing and the use of modern cars. Radiation curing is used as a very efficient, economically and ecologically attractive technology for the coating and bonding of many of the parts used in a car, and avoiding degradation of the coating due to photoinduced processes during the foreseen service time is a key issue. Ecological heat management and the OLED technology used for lightening and signage are further examples of useful exploitation of light-induced effects. This paper reviews new photochemistry-related developments such as radiation curing of automotive coatings on the three-dimensional car body, and gives an outlook on future developments.