SLOWING THE DRYING OF PAINT.
In wall painting or otherwise, especially in hot weather, if the paint dries so fast as to show laps in spite of your best efforts with the brush, the addition of a little cotton seed oil will make the paint dry slower without hurting the gloss; or if you are using flat color, and it dries too fast, a little cotton seed oil will make it dry slower, and not make a gloss. You can, by a little experiment, determine how much of cotton seed oil to use in each case.