Some woods epoxy doesn't want to stick too, also I had the experience once of the epoxy not getting hard because of so much oil in it, Padauk was the wood. Best to use Corby bolts or loveless. Here is a link to an article on gluing oily woods and identifying them by name. I always have used solvents like alcohol or lacquer thinner to wipe the scale off anyway and this article confirms that as the way to go.
http://www.wood-database.com/wood-ar...cal-hardwoods/