The small bottles of Aktivator and Primer are enough for several airplanes. One tube of Sika is enough for a full cabopy. It has a shelf life. Try to find the freshest one you can. It will keep for the duration of the canopy project if you seal the end but probably not much past the expiration date.
Aktivator 205, 250ml
Primer 209D, 250ml
295UV, one tube