Still Breathing

Only I have this pair of horns. Now these horns are horns of great loveliness being, as they are, crafted from translucent resin lovingly inked to look almost like the real thing. Unfortunately, these horns of splendour are rather heavy (well, heavy for two 2" blocks of resin) and I've yet to find any adhesive that will hold them on securely. Now it may be that I'm not using either spirit gum or mastix properly, and there may well be an arcane trick that will solve all my woes. I need them to stick to my head securely, to survive the occasional gentle knock, stay on through a veritable tide of perspiration, and remain safely attached for an entire day's roleplaying.

Can you help?