1 With more than 25 years of experience gained in both outdoor-exposure and accelerated-weathering tests, we recognised at an early stage that using a wood which was stable to solar radiation could significantly extend the lifecycle of a transparent coating. For this reason we often act as consultants, advising on the proper wood to select for a given application - as not all timber is able to meet customer expectations. It's my belief, however, that, if we ignore the different species of wood and just consider coating performance, we will find that the glass transition temperature of the coating film ...