The thinning agent for oil based paints is mineral spirits.  I've always wondered why it is called "spirits," which in most chemistry contexts refers to ethanol.  Of course, the two are quite different, the mineral spirits being non-polar, ethanol polar.

mcneely

---- Karl Wolz <wolzphoto@Q.COM> wrote:
> Not the same, though pretty similar. I believe mi deal spirits is a it hotter.
>
> Karl Wolz
> Sent from my electronic umbilicus
>
> > On Jun 19, 2015, at 2:34 PM, William <grateful@SWCP.COM> wrote:
> >
> > mineral spirits (paint thinner).  It does not damage the paint finish.

--
David McNeely