You really want a full surface glue job on foams for the best life and tire behavior.

I know plenty of people use CA glue to mount and repair foams as well, but I really don't like CA mounted foams, personally. Every time I've tried to use CA to fix adhesion issues, or used foams that were pre-mounted with CA, it always seems the tires chunk a lot easier to me.

Again, it's been since the early-mid 90's since I mounted donuts myself, but from what I remember, my shoe-goo mounted foams always seemed to be a bit more robust against chunking.