I've been contracted to remodel and update a salon and spa built in the early 80's. The styling stations are custom constructed with oak plywood faces drawer and door fronts. The client wants to save the cabinets but darken the color of the stain to a deep brown for the new interior look. The cabinet are very well made and worth saving .The existing stain is a medium brown with a poly urathane finish.They are one piece so I should be able to remove them easily to do the work in my shop. Could someone advise me on how proceed to restain and refinish these cabinet to hold up in this environment. Thanks Papadorf.