oil over acrylics ?

[kagemusha]

The 'oil' in oil paint serves two purposes....1) a lubricant to make them flow....2) a binder/drier for adherence and, obviously, to make them dry....
If you remove the oil on card this upsets the properties of the pigment/binder/drier....will cause the pigment to drag...and cause poor adhesion because it is drying too fast...
Oils dry by penetration/oxidisation....meaning that for best performance they need too have a surface to sink into...and the pigment to remain strong to hold it's colour reflectivity....
To achieve the best results the surface needs a good 'tooth'.....this is where an undercoat of any matt acrylic comes into play.....they provide a good ground for the oils to work with....
To get the ideal surface...apply the undercoat by aerosol or airbrush....you can then apply localised areas of acrylic colours as a further base to utilise the 'transparency' of oils...
The key to working with oils is in the amount you apply....the thinner the layer of paint the better the result....
Once applied....you can use several tools to 'thin' back the oil paint....brushes/sponges/cotton buds etc.
This may give you some ideas...http://www.planetfigure.com/threads/my-way-with-oils.52194/

Ron

 

[Eludia]

I wouldn't totally disregard leeching out some of the oil, some paints benefit from it as they are sometimes very oily (probably depending on the batch/age etc.). For example, I currently have a tube of Burnt Umber that seems to squirt out more oil than paint when I squeeze the tube so I've now learnt to squeeze it onto some card and leave it for 10 minutes or so till it returns to a "normal" consistency before using it. Most of my paints are ok and can be used straight from the tube but, like most things that are manufactured, sometimes you get a shonky one.

 

[kagemusha]

For tubes of oil paint that exude a lot of oil when squeezed....the simple answer is to hold the tube neck/nozzle on a piece of paper towel until only the paint itself is exuded...then use this..and not the overly oily pigment.

Ron

 

[Ron Tamburrini]

Jimmy S it looks like all your questions have been answered by Kagamusha Aka Ron C before I got home
Think he has covered everything , but a couple of points , if you use students oil paint rather than artists then you will get a lot of cheap oil in the pigment .
One way of dealing with the excess is to hold the tube cap up and give a couple of smart taps on something solid this will draw the excess to the bottom of the tube.

Ron T

 

[Alex]

You know what. This is all great advice.
I mean for oils, just squeeze a little bit of oil on your oily wood palette and apply just a little bit to your model and spread it as far as it can go.
No need for any medium when starting.
Cheers
Alex

 

[samson]

Great info and opinions

 

[Ron Tamburrini]

You know what. This is all great advice.
I mean for oils, just squeeze a little bit of oil on your oily wood palette and apply just a little bit to your model and spread it as far as it can go.
No need for any medium when starting.
Cheers
Alex

Thats it in a nutshell Alex