Be interested to see how using oil paints goes long term. I did a few works at art school with it, but generally used acrylic more often as it was faster and brighter.
Artist oil paint takes a very long time to fully cure, months and years, it's one of the aspects of the medium that people like as it allows really nice blending and adjustment during the period you are painting. You can see on old master works where the finished painting has been sealed, but overtime the underlying paint has continued to dry and shrink causing the top to 'craze' and crack. There is also the issue of colour stability over time, probably improved with modern pigments, but a lot of oil paint shifts colour over time, often darkening or losing pigment entirely.
Thinning it would speed up dry time I suppose. Somebody a while ago posted about doing this and I expressed caution for the above reasons, but I guess the best way to know for sure is to try it and see how it goes over time.
As already mentioned metho is not compatible with oil paint. We generally used white spirit or gamsol to thin it, but I'd suspect tehy would have a similar effect to turps on glue.
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