I use shipping tape for my pinheads, they can not get out w/ it - don't keep roaches - sorry( but I think that they can get out with the duct tape- put a small bit in , and see if they can get a grip on it ~ )
Bummer, okay thanks guys. I don't have any packing tape on hand and without thinking I started using duct tape, and then it struck me to ask before I continued. Guess its off to the store!