I used GB 444 for tarts. I know it's a container wax, but I had great results. I was able to use certain molds, but the wax would have to sit up and congeal for a long period of time. Then I can into frosting issues with certain colors-mostly blue and purple, but that would vary as well. So I spent a couple months researching different paraffin waxes. I decided to go with 4625 pillar blend and 4627 comfort blend container wax(es). 4625 is hard as a rock and comfort blend is like vaseline. I went with a 60/40 blend. 60 was comfort blend wax. These two waxes mix very well together. The scent throw is amazing. The color is fantastic. The best part is the consistency of the blend. Its hard enough to make a chunk tart, but it is very easy to cut. I had to wait a day or so to cut the chunks, because the wax was sticking to my knife a little bit. Overall, this is a great blend for tarts. I'm going to try 80/20 for a scoopable wax blend.