I have just finished testing GB464 and found that tempering didn't work (I remelted wax that I had poured about 6 months ago and repoured candles from it) I find the tops lovely, do get the odd crack which the heatgun sorts out, but in general they look good even after burning and setting up again. Dye definately makes a difference to frosting, so I prefer dye free. With regards wick, I have found (other than shrooms) an RRD 50 works in the 3" and 31/2" containers.