I've had 5 mixed samples of white label lube and 1 older one from Lyman sitting in the sun on my reloading bench. I'm looking for a lube that can hold up to the summer heat in central WA. I'm glad I had the Lyman lube in a saucer as it's turning into a puddle. I purposely left the white label lubes in the plastic bags they came in to add to the heat. None of the white label lubes puddled or even changed shapes. They did soften in the afternoon heat but looked just like they started out. I wish I'd done a sniff test on them as I would have picked the one that smelled the best when lubing bullets and then when shooting.
In the past I used a 50/50 style lube and had issues with it in the summer time. Hence the reason for the test.