It was a little clumpy as flakes, which worried me, but I crushed it
because that would increase the surface area. I've been keeping it in
hot water all day and it's mostly dissolved, so the situation isn't
quite as grim as I thought this morning, although I certainly won't
dare use it until testing it.

I did see on person say that heating it up makes the final finish more
brittle. But since only one person has said that, I'm choosing not to
believe it for now