I use Titebond II for almost everything. (I've become sensitive to CA, too.) I have used Titebond II thinned and didn't notice any roblems at all. Still got superstrong joints. I don't know of any of my planes flying off water, so I'll take other people's word on glue performance there. (Can anyone fill me in here? I'm not flying off water, but most of my planbes are for other people's use.)