Oil paint dries so fast during the summer here in Spain that I have been mixing a LOT of clove oil in my paints. I do that so that it stays wet long enough to blend tonal values, once they've all been laid out in a grisaille underpainting. The problem is -- even after a month -- the paint is dry but kind of chalky, so if I try to oil it out with any kind of medium - I'm using Liquin but it would be the same with any other medium - it smudges and moves the dry paint around and ruins the underpainting.
Does anybody have any suggestion as to how to fix the chalky underpainting so that I can glaze over it? One painting I did with less clove oil (still a significant amount, though) seems dry enough to glaze over, but even that would smudge I'm sure.
I sprayed charcoal fixative onto part of the chalky underpainting and it helped, but not enough and the underpainting still spread around and smudged I thought about spraying a matte varnish. Even an exhibition varnish would smudge around, so not sure what to do.