Do I need a special light source or angle to detect the flash? Especially for a black car.
IMHO You don't need a "special" light source to detect the CQUK 3.0 "flash".
Do one section at a time (half hood, fender, door, etc.) for proper application/removal.
Timing for removal is important. Do a small inconspicuous section first to get your apply/remove timing.
However, you will need "good" light/lighting to see that CQUK 3.0 is correctly wiped off.
Good lighting will ensure that CQUK 3.0 is wiped off correctly so there are no residual coating streaks.
I like using the
2 face towels Short nap side for bulk removal then the long nap side for final wipe follow up.
After the vehicle is completely coated and the coating removed, bring it into the sun for a final inspection.
If you are doing one or two coats do the final inspection and any addition wipe/removal after each complete coat.
Do this quickly, as a black car and the sun will cause CQUK 3.0 to begin the cure/harden.
Temps on the black paint surface can quickly exceed 140 degrees Fahrenheit.
Bottom Line: CQUK 3.0 is a fairly easy coating to apply/wipe off
IMHO the most important thing "on a black car" is prep/polishing and Eraser cleaning before applying the coating.