Spray-application of finishes during hot, dry weather can result in inadequate wetting of the siding surface due to drying of the atomized particles in the air. This could lead to poor adhesion and poor performance later on. Research to evaluate the performance of finishes applied to wood sidings in this manner would provide useful information on the effect of finish application during high temperatures and dry conditions. This surface damage can compromise performance of subsequently applied finishes. Research is needed to evaluate various methods of surface preparation and finish types over weathered surfaces to provide practical information on performance expectations as related to these variables.
Much information is accumulated through controlled experiments on outdoor test fences.
However, such testing is slow and time consuming. Developments have occurred in accelerated outdoor weathering, accelerated laboratory weathering and various other laboratory test methods such as adhesion tests. Continued developments in these areas are needed to keep pace with evolving changes in raw materials, formulations and equipment.