question on Painting topside on v20.

[STRESS]

Skools Out. I was concerned with overspray from not maintaining a wet edge. Is there anything I can do If I proceed with your method and have a problem with the paint flowing into the paint sprayed on the outside? The paint I will use is Interlux Perfection with 2316N spraying reducer. Would it be possible to have a second gun loaded with just reducer to help flash in the paint if the edge gets to dry? I know this method works with the old style enamels and lacquers.
Thank you.
Stress