Howdie... 

What I do is paint Povodine directly onto my face.  I use the the ring finger, the weakest finger (learned in theatre makeup), and massage it in.  I then put a drop of Jojoba on my finger and continue to massage it in.  So there is not a real measurement.  Just a 1st and 2nd coat.  Using just enough Jojoba to coat, but not too much that my face turns into a slippery slope.  

Povodine was working as is, but found that lightly massaging in Jojoba seems to have accelerated the process, and maintaining moisture too.  Pretty cool.  My wife noticed so I didn't have to promote the idea.  She just has said "I want to do what you are doing..."  Pretty cool.

Thought to return and add a little more info on the Povodine Painting and jojoba oil progress.  

It in a word goes very well.  I am very happy with the ongoing results.  It has really corrected some skin anomolies in addition to the age spots, like tiny but evolving skin tags and abberations.  Nothing more than painting and then using a little jojoba to add some emulsion character to it. 

One thing I have noted is to do this a little earlier than before heading to bed.  I find if I do it right at bedtime, it keeps me awake.  Am guessing it is the little surge of iodine perhaps???  But I find myself awake.  Painting a hour or two earlier gives me that appealing orange-y look, not, but I get to sleep.  

Main thing is I have not experienced anything adverse, like it being too harsh on the skin.  If anything, it has promoted a suppleness that I'd already had, but now moreso.

I just read about using collidal silver to get after age spots too, so will give that a go.  But I am really happy with the progress of this in terms of creating a rejuvenation of the skin.  I ingest a lot of olive oil and that has helped keep my skin looking much younger than it is, but still, the abberations that form with age are being dealt with via this simple act of painting, jojoba, and sleep.