Bill,
The PS is really not bad to work with. I guess the trick is patience, patience, patience.
The one tool that came in the most handy was the beer fridge. Actually, no... I wasn't drinking while ps-ing! I was able to mix up large batches and freeze/referigerate the remainder as I worked.
Each rib seems to take 40 grams. Yesterday, I needed to do 2 ribs, 80 grams of proseal. At about 1.5 to 2 hours per rib, I wouldn't need the ps again for at least another hour. I flash froze it as soon as it was all spread across the first rib. As I was closing in on needing it, I moved it to the fridge.
This just puts your mind at ease knowing that the concoction is still good and alleviates the hassle of mixing numerous small batches.
Patience is the key. Put it only where you want/need it.
Solvents: Coleman Fuel and MEK. Coleman is easier on the nose, but where I need a super strong cleaner, I use the MEK.
Acetone and laquer thinner are very fast drying and not as powerful as MEK, so I don't use them.
Hope this helps!

CJ