Applying decals is one of the final steps in model building, and when done properly, it can bring your plastic model to life.
Applying decals is one of the final steps in model building, and when done properly, it can bring your plastic model to life. National insignias, unit markings, serial numbers, and stencils all contribute to the realism and historical accuracy of aircraft, tanks, and vehicles. However, many modelers struggle with common issues like silvering, bubbles, and misalignment. The good news is that with the right tools and techniques, decal application can be straightforward and satisfying.
This guide covers the essential steps and best practices to achieve smooth, sharp, and bubble-free results on any plastic model kit.
1. Prepare a smooth surface
The number one cause of silvering (that frosty appearance under the decal) is applying decals to a rough or matte surface. Always apply a gloss coat before decaling. This gives the decal a smooth surface to adhere to and minimizes air getting trapped underneath. You can use a gloss acrylic or enamel clear coat, applied with a brush or airbrush. Let it cure fully before moving on to the decals.
2. Cut decals precisely
Even if the decal sheet includes carrier film around each marking, take time to trim each decal as close to the artwork as possible. This reduces the amount of clear film that will need to settle onto panel lines or rivets, which in turn minimizes the risk of visible film edges.
Use a sharp hobby knife or fine scissors to cut out each decal. Work slowly and keep your hands clean to avoid transferring oils to the decal surface.
3. Soak and slide
Dip the decal in warm water for about 10 to 20 seconds, or until it begins to slide freely on the backing paper. Some decals require more time—follow the manufacturer’s recommendations. After soaking, place the decal on a clean surface for a few seconds to loosen fully.
Then, using tweezers or a soft brush, slide the decal gently from the backing paper onto your model. Avoid dragging the decal into position—if it doesn’t go exactly where you want it, float it with a drop of water and reposition carefully.
4. Use setting solutions
To help the decal conform to the model’s surface details, use setting solutions like Micro Set and Micro Sol. These products soften the decal film and allow it to sink into panel lines, rivets, and texture.
- Micro Set should be applied to the surface before placing the decal. It improves adhesion and helps you position the decal correctly.
- Micro Sol is used after the decal is in place. It softens the decal film so it can conform to the surface. Don’t touch the decal after applying Micro Sol—it will wrinkle temporarily, but this is normal. Once dry, the decal will settle smoothly.
For complex surfaces or large decals, multiple applications of Micro Sol may be necessary.
5. Remove air bubbles
Even with proper prep, small air bubbles can get trapped under a decal. After the decal has dried, inspect it closely. If you see a bubble, use a fine needle to prick it gently, then apply more Micro Sol or press lightly with a soft cloth to push out the air.
Be cautious not to damage the artwork—always let the decal dry completely before correcting issues.
6. Seal and protect
After all decals are applied and fully dry (usually 24 hours), apply a clear coat to seal them in place. This final layer protects the decals from handling and prepares the model for weathering. Use gloss for a factory-fresh look, or satin/matte for a worn finish, depending on your build style.
Spray in light coats and avoid flooding the surface, as excess solvent can damage decals.
7. Weather with care
If you plan to apply weathering effects over decals—such as washes, filters, or chipping—make sure they are sealed properly. Use enamel or oil weathering products over an acrylic varnish for safe layering. Don’t apply aggressive solvents or sanding near decals unless you’re aiming for heavy wear effects.
Subtle fading, grime, and dirt can be applied to decals to help them blend into the rest of the finish, giving a more integrated and realistic appearance.
For modelers looking for quality kits and decal-friendly surfaces, ScaleCrafted.com offers a wide selection of plastic model kits and essential supplies to support smooth and realistic builds.
Mastering decal application takes a bit of practice, but with these techniques, you can avoid the common problems and produce clean, professional-looking results. Once you’ve seen a perfectly applied decal melt into the surface, you’ll never want to rush this step again.