Man oh man. No way am I using joy for tarts. Funny you should mention this because I am having somewhat of a dilemma on what to use for my tarts. I personally think the harder the wax the better for tarts. They hold up better, and look better. I was using NG MP145 for my tarts, but just like the MP123 they quit carrying it. I asked them what they thought would be a good tart wax and they suggested the palm pillar or thier pillar of bliss. I'm still not sure though. Like I said the harder the better. I started out with the joy for containers, and then switched to the mp123 (which I loved). I've tried the j50, and the j223, and it was okay, but then you order container wax from here, tart wax from there, then over there is where you get your fragrance. Why oh why does it have to be this complicated??? So there, now that I have vented I hope I helped you with your question. To me joy is too messy for tarts, and they just don't look as eye appealing. My personal opinion.