For oil painters: Increase the fluidity of your paint by mixing the colour with glaze medium (a mix of linseed oil, dammar varnish and solvent), and apply with a fine round or rigger brush for flowing, even, unbroken lines.

No matter what painting technique is employed, oil paints are most cooperative when applied from dark to light, wet-into-wet.

The next oil I would like to mention is Walnut Oil again naturally a very clear oil, it dries faster than poppyseed and it is felt to have an excellent refractive index for displaying pigments with the most possible vibrancy, it potentially can hold more pigment than linseed or poppyseed.