Hi Mike:
The bond areas on the wing skins is so huge that the safety factors for strength are massive. We calculated that the bond area for the wing spare to skin alone is enough to lift a 747 using the quoted values for the earlier Hysol. The key is resistance to avgas which all of them have. I would use the stuff in your fridge and be confident.
One hint for bonding skins. Drill lots of witness holes (1/8 in diameter works fine) over the spars. If you put a smaller drill drill or stiff wire down the holes when you bond the wing, you will know how thick the layer of epoxy is under the skin and on top of the spar. I found that it was MUCH thicker than expected (I planned for 0.020 inch when calculating quantity), and so had to pile a lot of weight on the wing to get the squeeze out and proper wing shape. A source of vibration would help.
As it was, I had lots of lead bags and 5 gallon buckets filled with rocks for both wings, and used them all on one wing to get the stuff to squeeze out and get the proper wing shape. Saddles were pulled down tight, but bent. ALL the rocks in buckets were piled on top of the lead bags in between the wing saddles of the first wing to get everything to settle into place. The second wing skin had to wait for another day.
As I recall, we used a crew of four or five to mix epoxy, apply, put down the skin, and then lock it in place and them pile up buckets. I would have more were I to do it again, with a good briefing at the start.
My guess was that we had over 500 pounds of weight to squeeze out the epoxy/flox mix. Temperature makes a huge difference in viscosity and squeeze out. You want cool to prevent the stuff cooking off too soon, but warm to make it thin. Speed is important and having lots of spreading tools and hands is mandatory.
Post inspection looking through the holes Into tanks and with mirrors into the fuel fill port, we found a nice squeeze out, but no drips of excess, so the estimate of 0.020 inch thickness for the bond line worked out OK.
Fred Moreno