Decal setting solution

Decal setting solutions are a pair of liquids used to help a thin printed decal behave like painted-on detail rather than a sticker sitting on top of the surface. A setting solution applied to the model before the decal helps it slide into position, while a softening solution applied afterward chemically relaxes the decal film so it drapes down into panel lines, rivets, and other surface texture instead of bridging over them.

Using them usually means applying the first solution, sliding the decal into place with a brush or slider tool, then applying the second solution over the top and leaving it undisturbed while it works, since touching a softened decal can tear or wrinkle it permanently. Stronger softening formulas exist for particularly stubborn decals over heavy surface detail, though they need a gentler touch since they soften the film more aggressively.

A common mistake is touching or repositioning a decal after softener has been applied, when the film is at its most fragile and easiest to tear. Another is skipping softening solution entirely over raised or recessed detail, which is one of the main causes of silvering, where trapped air under the untreated film shows up as an unwanted shiny patch once the decal dries.