You need to work quick in hot weather. Every 10 degree temp difference is about 1/5 less pot life. Pictures ?
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Guys who are really experienced and work quickly can work out of a cup. Forget what kind of material your using that really isn't the issue. Both Epoxy and Poly will go off faster when left in the cup. The scientists on here can tell you why...I just learned like you...the hard way. I think that GL even recommends it in his videos. Pour it out in the flats and work it around nice and easy but with purpose. Coverage first...work out the small stuff after you've spread it out really well. Use more resin than called for on your first few boards. You can pull out the excess once you establish good coverage. On the Bamboo I use two batches. One to wet out the topside of the rails then flip it and use a larger batch for the flats on the bottom. I found it easier to use a 2" chip brush with 1/2" of the bristles cut off to do the topside of the rails. The first thing I do is cut in the tape edge (refer to my earlier post) just like painting a room...only cover a small edge of the tape...then wet the rails out liberally (horizontally nose to tail). Then you can use the brush to clean up any runs etc and pull the resin down like you were using a squeegee to wrap the laps. I never worry too much about the resin being too heavy in the rails just the runs. Then flip...mix and use the larger batch of resin but pour it all out..use a bondo spreader....low angle of attack...you want very very little friction to get it to wet out plus you don't want to pull on the fabric too much. After it's good and wet out you can increase the angle of the spreader to pull out the excess....don't worry about trying to get it too dry...better to have too much than not enough. I even did half the bottom on my first go around to make sure it didn't go off too soon and it worked perfectly. The one thing I really like about the bamboo and Epoxy combo is the abiltiy to work in small batches if you want to (especially if it's hot outside). If you get it all on there in less than an hour or so it blends just fine. I you tried that with regular fiberglass it would be a disaster! Don't ask me how I know!