I feel your pain with regards to temps. Had to order plastik honey to hopefully be able to get filler spread. I asked SPI about temps for epoxy and was told it loves heat. I have sprayed several times at 110 or more. So I hope so….
My problem is the metal gets to 180+ outside. It dries too fast for my liking at those temps. In the shade I would be spraying but it won’t fit in my garage on the rotisserie