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As I know nothing about glazing, I find I am not brave enough to try the experiment on an almost-finished painting, so I will paint opaque on top.
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What is the point of underpainting if you ignore it and paint opaquely on top of it?
Adding a glaze is a piece of cake. Take a little bit of transparent color (i.e., a color you can see through like; sap green, raw sienna, prussian blue, etc.) and add a lot of medium. Paint this mixture over the area that you wish to glaze.
Do not try to glaze with an opaque color (i.e., white, yellow ochre, indian red, etc.) When you "glaze" with an opaque color, it is called a scumble.
If you don't like the way your glaze looks, wipe it off before it dries and try something else.