This report examines the issues involved in maximizing the performance of white spruce siding. Background on the factors that affect exterior finish performance is given. The report reviews the various types of exterior finish and makes recommendations for those most suitable for spruce siding. A factory finished and quality assured spruce siding product from Sweden is discussed as a model for maximizing service life of finished siding. Test methods for finish adhesion and durability are summarised and recommendations made. The longest service life will be obtained from edge grain spruce, factory finished with a two coat acrylic latex paint or solid colour stain, preferably with a water repellent preservative and primer underneath.