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Fat Over Lean Solvent Free?ApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2020-10-24 17:28:45 ... Most recent comment 2023-03-04 12:46:56
Oil Paint

​If I paint solvent-free with oil paint straight out of the tube for my first layer, and let that dry to the touch for my second layer, and so on for subsequent layers, do I have to make each subsequent layer fatter by adding a little oil to my paint nuts, assuming I use no solvent ever? Or since there is no solvent do I not have to make each layer fatter? Thank you.

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Moderator Answer (brian baade)

[2020-10-24 19:54:44]

It is my understanding of current CPVC thinking is that you could continue to layer well-made solvent free oil paints over each other without necessitating the use of additional binder. This assumes that subsequent layers are similar to those beneath them. This is imperfect in practice as low oil absorption paints applied over high absorption paints can cause problems (as I have seen innumerable times when doing conservation work).  I see no issue adding a very small addition of extra binder to subsequent layers.

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User Comment

[2020-10-25 17:47:39]

​Thank you. 

Can you please explain what CPVC has to do with fat over lean?

Also, you wrote "This assumes that subsequent layers are similar to those beneath them." Similar in what ways?

 Finally, what determines whether an oil paint is low or high absorption?


Again, many thanks for your thoughts and expertise.

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Moderator Answer (brian baade)

[2020-10-25 21:02:59]

​It is easier if you read over this thread which covers some similar ground

https://www.artcons.udel.edu/mitra/forums/question?QID=663


Some pigments require a minumum of oil to be properly bound while others require a high percentage.



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User Comment

[2023-03-04 12:46:56]

Yes, i donot agree that it is no brainer kind of practice that you paint in layers straight from tube, unless you use exact color each layer, then you are painting walls:) 

in practice, some paint contains more oil than other, even you paint straight from tube that putting leaner one on top of fatter one is not good.

​more importantly, here not even consider different drying speed of each oil, which is another very complicated concept that judging fatter or leaner, if you place straight tube a faster drying color over a slower one, then it will be another big issue agin. 

however most manufacture not really help to clear out which color dries faster than the other, so it becomes another confusing concept for artist besides fat over lean. 


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