Mai:
Once you sand it, you will have to make a determination as to whether the underpainting is still showing through cleanly enough to warrant giving it another try with a glaze. You may end up having to paint opaquely over it simply because the underpaint is obscured.
It sounds like you are having a bit of trouble adjusting to the Galkyd. You may want to evaluate how you work and choose a medium that reflects your working style and preferences. Remember that a medium is only there to get the paint into a consistency for working, so use the medium somewhat sparingly so you have more pigment than oil.
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