Ok so I know Krylon Fusion is the recommended paint for use with aquariums, but why? What is the actual type (i.e. acrylic etc) of paint that is water safe? The reason I ask is I'm working on something that will require a little more detail than I can get with spraypaint. Also is this paint safe under the water rather than just in contact with it? I've been beating my head against a wall trying to figure out how best to proceed in my project.