Wood treated with carbon-based preservatives is often used in applications where coatings are required, yet few studies have examined the effect of such treatment on coating performance. Users need to be confident that coatings on carbon-based preservative-treated wood will perform as well as or better than those on untreated wood. The present study examines the performance of three coatings on untreated wood and wood treated with three carbon-based preservative formulations after two years of exposure at two test sites. Samples treated with carbon-based preservatives were on average more resistant to black stain than those that were untreated. Coating and substrate degradation was generally similar, or slightly less intense, on wood treated with carbon-based preservatives than on untreated wood.

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