Mine does that whenever the weather gets hot, which is to say all summer. It's still OK, its just now liquid, until it cools off. If you bring it into an air conditioned house it will re-solidify, and if you catch it as it cools down you can stir it back together -- though I typically don't bother. Personally, I was pretty disappointed with the low melting point of the Boelube "paste". Great if you're working in a climate controlled area, but for those of us working in garages and hangars it goes from rock hard in winter to liquid in summer.