Glazing

To glaze the bottom, one option is to use a stilt during firing.

A container of dipping glaze.  Make sure to mix it before dipping.

I sanded the bottom of this bowl, after it got stuck to the kiln shelf.

If there are any small blemishes left on the base,
after a glaze fire, they can be removed with a dremmel.

Wax may be used to create a decorative touch to a piece.  It acts as 
a resist to any further glaze application.  Some artist will apply a 
thin coat to the bottom of their work before dipping it in glaze.  
Another option is to wipe the bottom on a piece of carpet to 
remove any unwanted glaze.

On the left is a piece before it is fired.  On the right, is how it will 
look after it is fired.  Glazes undergo a chemical process when they 
are heated.  The colour of raw glaze is often surprisingly different 
from its post-fire appearance.

If calipers aren't your thing, a nice way to use dipping glaze is to 
dip one half and then the other.   The cross over that inevitably 
occurs can be quite spectacular, if not altogether unexpected.  

Remember to experiment and have fun with glazing.