What finish can I use on a piece made with mixed woods that will cure on the cocobolo and retain the color of the purpleheart?
Michael Dresdner: Your best bet is an exterior water-based finish that contains UV blockers or absorbers. As you seem to know, oil-based coatings often won’t cure on dalbergias such as cocobolo. As for retaining the color of purpleheart, any exterior coating that contains UV blockers or absorbers will slow down the color change, but nothing will stop it. In the end, the sun always wins.