If the instructions say glue then most the new kits mean CA glue. If they say epoxy they usually tell you what type. CA comes in three types, thin is very fast setting and once it touches the two balsa halves it is set. Med. is A good choice, much slower then the thin and you can shift the parts if you hurry. The thick may be your best bet, much slower. All the CA types are harder to sand but it isn't as bad as some people say. The wood glues are an over night wait. They still make the ambroids and tester wood glues that most of us old time guys learned to build with. I use mostly the CAs but I always have Elmers wood glue on hand. Buy some small bottles and try them out on scrap wood to see what you like.