The nice thing about using oil is that it dries so slowly you have a lot of time to get it just right.
I thin it a bit with mineral spirtis, and it takes a couple of hours to start to set.
I apply it with q-tips, artists oil & acrylic brushes, and MicroBrushes mostly. Then i work it around with q-tips... removing some... adding more... adjusting it till I like it.
Then set it aside for a day or so to dry.
www.naplak.com/modeling ... a free site for modelers
www.scalehobby.com/forum/index.php ... a nice Modeling Forum