Yup, Saddle Tan is the worst to get an even color.
Took me quite a while and practice to get it to go on smoothly. The Pro Oil dye does take a while to dry completely and will look blotchy for hours before it finally clears up.
I use fast overlapping strokes in one consistent and even run over the entire piece. Occasionally I'll go over it again in an opposite direction. The key is not stopping if you can help it, the stopping point is where you will get blotching. Another good thing to remember is to try to remain consistent with both speed and pressure on the dauber. Push harder and more dye will be deposited, lighter strokes will cause streaks.
Sandy did warn, I read a while back, against using the water technique with Pro Oil dye. Something about oil and water causing issues. The water method works well with spirit dyes evidently, though I haven't tried it.
I've been using the Pro Oil dye for many years now, and still get the occasional blotchy dye job, its the curse of the Saddle Tan I guess. I just toss and start again, no biggie.
Yea, I keep telling myself that....