Yes, linseed oil. I used to use poppy oil, but I have heard that poppy oil is given to cracking pigment too, so I use it no longer.
Edward HopperThere will be, I think, an attempt to grasp again the surprise and accidents of nature and a more intimate and sympathetic study of its moods, together with a renewed wonder and humility on the part of such as are still capable of these basic reactions.
Edward Hopper