Spanish cedar is used for furniture in south America, as a lining for cigar humidors (from single cigar to room size), and apparently for front doors in your town. It is not a cedar, but smells somewhat like aromatic cedar.
I was warned to watch out for spanish cedar with sap pockets, because it would ooze forever (apparently what Marty found), but you can buy the "clear" wood that doesn't apparently have the problem (none of my stock has oozed).
Since it is used for furniture and front doors, I assume it finishes well, unlike real aromatic cedar, where the chemical that makes the anti-bug aroma is also a component of paint remover. I have heard horror stories of cedar chests where the finish on the inside of the fine hardwood lid or other parts got gooey/stickey over time. The theory was that shellac might survive the cedar, or I might try some of the new water base conversion varnishes, etc., but if I were to build something of aromatic cedar today, I would be sure the inside didn't have any components that needed finishing.
I have not had any problem with unfinished spanish cedar in cigar humidors hurting the surrounding finish.