Talking of light and camera trickery The other night as the sun was sinking low in the sky the paravan turned a dark blue for about ten mins It was really surreal
I think you will need another liter dude Some bits have sank over time and other bits have cracked because of it
Would look amazing all in glossy black, although the waxoyl would cover it so I guess it'd be pointless.
I was very tempted to paint most of the underside in rustoleum the same colour as the body The black and grey parts would have looked awesome against it The thing is its not a show van and the underside is going to get caked in cow Marmite and mud etc so the underseal is the best approach