Science Buddies: "Ask an Expert"

Hi,

We are trying to identify what to mix as a binding agent when making bath bombs. We followed a recipe on this board with some success... I was wondering if there was some way to add something that would make all the ingredients stick to make a really hard bomb?

Also, I had read that somewhere that baking the product helps it bind stronger... is this true?
Ian

Apologies... also, is there anything that can be added to make a "fizzier" bomb?
Ian