Try Gator's Grip Hobby Glue. I've been using it for PE and this stuff is great. You can order here:
http://www.gatorsmask.com/gatorglueorder.html
Great review of Gator Grip here:
http://modelshipwrights.kitmaker.net/modules.php?op=modload&name=Reviews&file=index&req=showcontent&id=2660