Here is another tip for better results.
If you lay the partial (un glued) in position on your head and then fold it back to reveal the underneath.
With a makeup pencil, mark 2 tiny dots on either side of your scalp and corresponding ones to the underneath of the base.
Then lay the partial back down in position.
Using the teeth of a comb, press the teeth along the hairline edge of the partial down on to your scalp.
You can then remove the partial and you will have the perfect indication where to apply your glue.
Once the glue has dried, you can line up the dots again and place the partial in position.
This way there will be no extra glue at the front of the piece.