The effect of protective pre-coats on the performance of transparent and semi-transparent coatings was evaluated in two experiments. The present report describes the performance of protective pre-coats after 36 months of field exposure, and the performance of pigmented protective pre-coats after 12 months of field exposure. In the first experiment, heartwood, preservative treatment, and the use of protective pre-coats were associated with better stain resistance and enhanced coating performance. After 36 months of exposure all groups were severely degraded, and this experiment was concluded. In the second experiment most of the coatings remained in moderately good condition after one year in test. There was no separation in performance between unpigmented and pigmented protective pre-coats. This experiment will be continued to determine whether pigmentation improves the performance of protective pre-coats.