The drying rate of air-drying systems is, as already mentioned, slow and even for reacted oils as
alkyds the drying is too slow for commercial applications. The drying time is therefore
commonly reduced, by adding metal driers to the system, as these catalyze and hereby accelerate
the drying process. The drying time can hereby be reduced from days to hours. The presence of
efficient driers is therefore essential for the drying of air-drying coating systems