So, I finally decided to do it.
As others have mentioned here, this stuff is stupid easy to work with.
I just masked the markers with blue tape, then covered the surrounding
area with sheets of computer paper to protect from overspray.
So, after setting up the first lens, I shot 3 even coats on the lens.
Then I moved to the second lens and masked it.
When I finished that, I came back and removed the paper and tape from the first lens. PERFECT!
I then used the same paper and masked the second lens.
Then I shot it.
Repeated on the 3rd and 4th lens.
Used the same paper for each.
The whole job took about 1 hour and 15 minutes.
I'm very pleased with this job.
Pictures below:
4th lens ready to spray (you can tell the paper has been re-used)
4th lens shot
4th lens finished
Some pictures in the driveway: