The future is to lay down a gloss coat before you put the decals on. It also helps the wash to flow better and makes it easier to take off than on a flat coat.
Tanky hit the nail on the head… it can become your best modeling friend!!!
It is nothing more than Future acrylic floor polish from the supermarket. It’s about $4 a bottle and one lasts forever. Seals and protects paint, a must for panel lines and other weathering… There’s an article about it on swannys webpage as well.