I exclusively use Aerodux Resorcinol, and I buy it by the quart from Amazon. It can be a little pricey, but one quart will glue up about 14 bows, so it's not that bad.
All other glues and epoxies that I have ever heard of can get brittle in the cold, and gets soft in the heat, even to the point of delamination, but resorcinol will NEVER do this. It doesn't get soft in the heat, doesn't get brittle in the cold, and it is not affected by moisture at all. The only down side is a dark glue line, and it doesn't fill gaps very well.