Expensive and very hard to use effectively

I had been waiting for this to be available in Canada for years and was so excited when I finally found it at Michael's. It was really expensive - $20.00 - but I bought it anyway because I love the look of Mercury glass and wanted to make so glass balls for my Christmas tree. I also bought a few glass vases to try out. These were all wasted projects because it I couldn't get the paint to work - it wouldn't adhere to the glass and when it did, it was incredibly streaky. It left big "bald" patches in spots and took forever to dry so it streaked like crazy. I tried everything and watched a LOT of tutorials on how to use it so I am confident that it wasn't my technique. I am very disappointed in this product - I should have just stuck to buying a few pieces of the real thing, instead of trying to fake up a bunch of garbage.