@Jon Tofte I've been ordering it off Amazon but you can get it other places also.
Product Description
Designed for exterior wood applications, this varnish coats your wood with a tough, protective finish that will withstand the rigors of the sun, rain and wind. Ideal for outdoor furniture, doors and case goods, Exterior 450 is fortified with UV absorbers to help minimize fading and maximize performance. Its built-in mildewcide retards mold and mildew growth. Available in Satin, Gloss, and Semi-Gloss.
Exterior 450 is tough and flexible enough to handle the expansion and contraction of wood through hot summers and cold winters that typically causes cracking and peeling. Available in quarts or gallons, it flows well and dries rapidly to a clear finish. It's also low Vac and low odor. Water base
I'd like to try more products from General Finish
Well I'm just now reading that it doesn't recommend 450 topcoat with ipe Ironwood so I'll have to do some more reading. It looks like it suggests General finishes outdoor oil so I'll have to do a little digging.