Another tip (pending further confirmation):
Last time I used moisture cured urethane (Chassis Saver to be specific), it was a hot muggy day in Nebraska and the stuff was curing on me almost as fast as I could put it on (I was pouring out small amounts into cups).This time it was chilly and humid in Washington, again not ideal. I decided to try sucking up the stuff out of the can with a bunch of disposable syringes from the party store, and cap them for use during my painting. This was Saturday, and tonight I checked a partial one I had leftover, and it was still perfect! There was a little crust on the cap but the stuff was perfectly liquid inside. I will keep it around and see how long it lasts. Sucking the stuff out of the can also means no spilling and no glued on lid, and you can drip it from the syringe onto your work to spread it with a brush without even having to fill up a cup. Should work with POR15, Masterseries, Chassis Saver, etc.
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