The XceL has adhered to the glass with no pull away at all. The containers were washed with hot soapy water left to dry and then poured at room temp. We have had no problems with cracking or wet spots. The only problem is with the tops but heat gun makes them as smooth as glass. At what temp are you heating the wax upto? At what temp are you pouring? How much dye and scent are you adding? At what temp are you adding your dye and scent? How long are you allowing your dye and scent to bind? When we make candles we do not rush the process. We slowly drop the temp down to 110 before we pour. When I say slowly I mean we allow 20 to 30 mins to drop from 180 to 110. Some may call us crazy but we do this to assure everything binds. We want to produce quality candles and we are willing to put the time and work into it. Because of this we never rush the process. I am a perfectionist, I am blunt and I am honest. I cant help it, it is just the way I am wired. I drive my partner crazy but I will have it no other way. Sometime I dont know why my partner puts up with me but I know deep down she really understands. That is why she puts up with me but there are days I get looks that could kill.