I am trying the Salt and Hairspray method together with Vallejo Colors.
Mostly I use Vallejo Air, but sometime Model Color, too.
I have tried Hairspray and some other fluids like chipping fluid and worn effects from AK to separate the underlying color from the top color.
Unfortunately the adhesiveness of the Vallejo colors (which I only thin with a little water (if at all) ) is so good, that - after soaking with water - it feels like having some kind of solid colored film on the underlying color with some water between both layers. I can scarf it and remove shreds of color, but I cannot thin the upper color to let the undercolor shine through.
I hope I could describe my problem for you to understand (sorry - non-native speaker

Does anyone of you know a way to reduce the adhesiveness of the Vallejo paints?
Or other colors which work better with Hairspray?
Cheers
Thomas