When using a label on the bottom of the candleholder please be aware that the bottom of the Glass is not always flat. It is the part of the glass that has the greatest tolerance. When designing labels we recommend that you do not use clear labels. The diameter of the label is large enough to go over most of the diameter.
If you then wish your label to look presentable the edge is only stuck leaving a void in the middle to hide the dip, otherwise you end up with a crinkled label. Alternatively you use a smaller diameter that covers the very middle.