Hello! I am wanting to make a bath fizz powder (as opposed to a bath bomb). I have made a few test runs which seemed to turn out okay, but now I am having a few significant issues. 1.) My powder recipe is turning as hard as a rock. I would say it would be a perfect bath bomb - but definitely not what I was going for. 2.) Once I seal it in a bag - the bag begins expanding with air. I have even had a few of the pop. I did try drying it out for a few days before sealing, and it still expanded. I live in a mostly hot and dry climate during the summer months. Any idea what is causing these problems?