This 2 component 5 min epoxy is the go to for many fly tyers that need super durable heads on flies, and lots of them.
With 2 separate bottles for resin and hardener you are safe for glueing one or the other shut.
ZFPT38
Zpoxy 5-min (8oz, 236ml)
ZFPT38
15 in stock (can be backordered)