If you use the dremel just go over it with the 60 grit.
What type of glues are you using?
Lots of guys will use different stuff for different parts.
Epoxy for spiders, amazing goop for surround, CA glue for dustcap.
I've used just about all of it.
Amazing goop has some really good give/take so it work well with surrounds. Almost acts like a really dense rubber.
For all my recones now I just do CA glue for everything.
My spiders get double. I do a pretty good size bead on the spider landing, let that sit, spray, harden. Then ill do a bit on top and I'll seal in the sides as well.
Oh with CA glue and activator, the activator will hang around for a bit. So when you put down glue, it might start to activate right away because of the activator in the air.
So once you do your first spray, you kinda have to work a little faster.