Putting together this kit - 3" LOC cardboard tube with fiberglass fins. Normally I'd use rocketpoxy for everything, but hoping to speed things along. For complicated reasons (see below if you're really interested) I can't do what I'd usually do - glue all 4 fins at once with a fin guide. I'm going to do them one at a time. Since RP takes a solid day to dry, gluing one fin at a time is going to take ages. Now... normally I'd shy away from 5 minute epoxy for an HPR build, but I was thinking - if I just use it for the fin roots then do some solid internal and external fillets, I should be good, right? And this way I can knock out all 4 fins (at least the initial gluing) in a couple of hours instead of several days. The longer "why": Whoever cut the fin slots on this kit didn't cut them at exact 90 degree intervals. So instead of being 0/90/180/270, it's more like 0/90/181/273. So my Payload Bay-template-on-foamboard alignment tool is off by just a little bit. My solution is to glue one fin at a time using the alignment tool, then embiggen the other slots in it, so only one fin is held tightly. It's not perfect, but it should work.