ques: OIL DRIERS and FIXATIVEs

HOW to EXPEDITE the process of drying of oil paint ?

Apart from different DRIERS that you can add to oil paint - (i.e. to mix with paints on pallete BEFORE applying to canvas) -

is there ANY OTHER fixative/drying/consolidating agents that you can apply onto freshly painted layer right on canvas ?

(I heard about some spray cans that, when sprayed over fresh paint, can facilitate drying process, but I have never seen or come across them...)

First of all, I assume you're referring to OIL PAINT.

You have a choice, depending on your working methods. I've always favored cobalt lineate drier, added dropwise to my palette cup filled with my favorite medium. More recent chemistry has created alkyd based driers, the likes of W&N Liquin, which are also good glazing mediums. Japan Drier is another alternative, although it's just a more expensive version of cobalt lineate.

If you explore the chemistry of oil paints a bit, you'll learn that it's necessary to MIX the driers or accelerators WITH the paint in order to achieve the desired result. The driers act as 'catalysts' which accelerate the drying process, analogous to using two-part epoxies, or some other coating that relies on chemical reactions and not simple air drying. I know of nothing that will work after the fact except time and temperature. You can try placing your finished painting - the slow-drying one - in bright sunlight. That will sometimes speed the chemical reactions needed to 'harden' the paint film.