thinning oils

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Neither. I simply squeeze some paint onto my palette, mix, and start painting. Shep Paine got it right in his book, "Spread it out, don't thin it out."
 
The only time I thin oils is when I am painting details like stripes. Then I use a bit of Grumbacher medium I or linseed oil. If you thin your oils for general painting then you reduce their covering power and blend-ibility.
 
I'll guess I'll be a bit contrary. :lol:

Some oils straight out of the tube are... well.... paste-y. I will add a drop or two of turpenoid to a dime size dollop of paint. This is enough for me.

The others have already mentioned the down side of thinnner. I'll also add that it will increase the glossiness.

There are no rules ;) . Try experimenting....

Keith
 
At a very first time I didn't thin my oil colour as I read in some tutorial books and articles on various magazines. Now, and after having seen and spoken a lot with some friends of mine that with oil paintings make miracles ( i.e. Gianfranco Speranza) my technique is a little bit changed.
I use as thinning a Quick drying petroleum medium from Lefranc & Bourgeois only and only this medium. It helps the colour to dry perfectly matt, sometimes also without the classic oven drying. It is clear that if you use too much of it, the covering properties of the colour could be less, but I haven't never a problem with this method of thinning.
Try to not thinning a red or a blue, then tell me if the final work you made with them is perfectly matt (expecially if you paint napoleonics, as me)...
Good work.

Marco
 
I use oils straight out of the tube without thinning. If the paint is old and really thick, I add a drop of mineral spirits. I only use mineral spirits or a drop or two of Grumbacher matte medium
it is important to spread the paint as thin as possible. To thick and it will show brush strokes and it is more likely to dry glossy.
 
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