Fritz, I use Superphatic glue from Hobby-Lobby, it soaks far into the wood and a plane will noy break at a glue joint if misfortune happens. Some claim it's hard to sand but I have not noticed that, it sets in 20 minutes so I do as mentioned above, I plan ahead. I built an LT 40 only using it except on the firewall and a TeleMaster 40 using it on everything except the firewall and the gear plate.