The older Sig kits such as the Kougar and Kommander include very good instructions on how to sheet foam wings. They recommend Core Bond - their own brand of latex contact cement which is probably just relabeled LePages or similar. I found using the contact cement pretty easy, and got excellent results on 3 Kommanders, a Kougar, a Komet and a Tri Star. Does their method stand up?? Definitely! Some of my jobs are well over a decade old and are standing up very well.

Regards,
Kelly