gloss, color fading and chalking of the surface area, followed by other aging effects which can cause severe damage of the entire coating film (e.g. delami- nation, etc.). The question is, how can paint formulators and producers maximize the lifetime of metal coatings to meet the required highly demanding specifications or long lasting warranty demands of the end users? Coil coating paints are always formu- lated with many different paint ingredients as there are paint binder resins, pigments, matting agents, crosslinkers and catalysts, solvents and surface-active additives as well as sometimes special effect substances. Every single component is playing its individual role in the paint formula. But without doubt, the main binder resin as major part is always of special importance. It provides the already above mentioned mechanical and chemical resistance and is mainly responsible for hardness, flexibility and substrate adhesion of the finished paint film. Commonly used binder resin technology for coil coating applications is acrylic, epoxy, PVC, polyester, polyurethane, silicone modified polyesters (SMP) and poly vinylidene fluoride (PVDF). All of these materials are well-suited as paint binders but in fact, with approximately 70%, polyester resins share the big- gest volumes. In the majority of cases, modern so called “super-durable” polyesters (SDP), providing excellent UV and weathering resistance, can meet the requirements for long-last- ing and durable protective and deco- rative architectural paint films. Typically in combination with amino- plast resins as crosslinkers. Polyester- polyurethane systems show even improved performance. However, high-end coil coating sys- tems for roofing, composite and building panels with very long-lasting warranties are to some extend formu- lated with PVDF binder systems. These are usually a blend of about 70% chemically and photo-chemically inert PVDF polymer and 30% of a polymethacrylate polymer as a co- binder and kind of a carrier for the insoluble PVDF. No doubt, this partic- ular class of paint binders can provide outstanding durability, very good dirt-pick-up-resistance and for exam- ple also good resistance against graf- fities. Coil coating paint suppliers 69