bowing=warping (we usually call it warping - or "lifting corners".
I find hairspray even better than glue stick and I use 100C on the UM2. Clean the glass first to get any oils off it, then when dry spray with hair spray. Also it is important to use brim. Lots of brim - at least 10 loops. And make sure the first layer is squished down enough so that the brim touches itself nicely and touches the part.
Use blue stuff - unscented:
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zoev89 73
I print with a buildplate temperature of 115 degrees which gives me about 100 degrees surface temperature (4mm glas). I have good results with gluestick but I do add a brim to the model. And keep the model warm while printing. Enclose the ultimaker a bit helps. Do check the motors if you enclose, that is why I have them on the outside.
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