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So I can finalise values as I'm finishing off a monochrome underpainting I'll oil out before a painting session (the painting is usually at least 4-6 days dry). I'll give it a very fine wipe of linseed oil (palm of the hand to spread it around works well then wiping thoroughly off with a low linting cloth like a fine jersey).
For more long term controlling of those pesky sinking in traits, of umbers in particular, I'll very lightly brush on a weak retouch... but beware - tempting as it is even a little too much stand oil/dammar/retouch in your underpainting makes for a very unworkable and unpleasant surface for glazing or whatever other technique you favour... I've made that mistake before and ended up having to sand the whole thing back to get rid of a too slick surface!
Cheers
MJ
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