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How to Apply Model Decals Without Silvering
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Decals give a model its identity: the national insignia, the unit codes, the nose art and the stenciling that tells you exactly which aircraft or tank you are looking at. Done well, they look painted on. Done badly, they show a shiny film around the edges and a silvery haze where air is trapped underneath. That haze is called silvering, and it is almost always avoidable once you understand what causes it.
How water-slide decals work
A kit decal is a thin layer of printed ink sitting on a clear film, called the carrier film. Underneath is a water-soluble glue on paper backing. When you soak the decal, the glue dissolves and the decal slides off the paper onto the model. As the water dries, the glue holds the film in place.
The problem is the clear film. It is never completely invisible. If it sits flat on a smooth surface, light passes through it and you barely see it. If it sits on a rough surface, tiny pockets of air get trapped between the film and the paint. Light bounces off those pockets and you see a silvery or milky patch. That is silvering.
Why decals silver
- Matte paint. This is the main cause. Matte and flat paints have a microscopically rough surface, full of tiny peaks and valleys. The decal film bridges over them and traps air.
- Too little water or glue under the decal. If you blot too hard or the decal dries too fast, there is not enough adhesive to fill the gaps.
- Raised or recessed detail. Rivets, panel lines and weld seams keep the film from touching the surface unless it is softened.
- Old decals. Decals from older kits may have weaker glue and stiffer film.
Every technique below addresses one of these causes.
Step 1: The gloss coat
Before any decal goes on, the surface needs to be smooth and shiny. Spray or airbrush a clear gloss varnish over the painted model and let it cure fully, ideally overnight. You can gloss just the areas where decals will go, but glossing the whole model also prepares it for a wash later.
Brush-on gloss works too. Apply it thinly with a soft, wide brush, and let it level itself. The surface should look like a wet car body when you hold it to the light. If it still looks satin, add another thin coat.
Tip: Gloss coats can be lumpy if you spray too heavily. Several light mist coats, a few minutes apart, give a smoother result than one heavy pass.
Step 2: Prepare the decal
- Plan the order. Read the instructions and mark which decals go where. On a P-51D, for example, you might have dozens of small stencils as well as the big insignia. Apply the large decals first, then the small ones.
- Cut close to the print. Use a sharp hobby knife or fine scissors to cut each decal from the sheet, leaving as little clear film as possible around the printed area. Less film means less to hide.
- Soak it. Dip the decal in lukewarm water for about 10 to 20 seconds with tweezers, then lay it on a paper towel. Do not leave it floating in the water; the glue washes away. After a minute, test whether it slides on the backing paper.
Tamiya HG Angled Tweezers
Angled tweezers with fine tips let you pick decals out of the water and hold the backing paper without touching the decal itself. Finger oils on the film can stop it from sticking properly.
Check price on AmazonStep 3: Setting solutions
Setting solutions are what separate a good decal job from a great one. There are two types, and they do different jobs.
Micro Set: the blue bottle
Micro Set is a mild solution you brush onto the model before placing the decal. It improves adhesion and helps the decal lie flat and settle on gently curved surfaces, which reduces the risk of trapped air. Think of it as a better version of water.
Micro Sol: the red bottle
Micro Sol is stronger. You brush it over the decal once it is in position. It softens the film so it sinks down into panel lines and wraps over rivets and raised detail. As it works, the decal may wrinkle and look ruined. Do not touch it. It flattens out as it dries. Poking it while soft will tear it.
Microscale Micro Sol & Micro Set Decal Solutions
Micro Set and Micro Sol together are among the most widely used decal solutions in the hobby. Use Set under the decal for adhesion and positioning, and Sol on top to soften it into panel lines and over raised detail. One pair lasts through many kits.
Check price on AmazonMark Fit and Mark Fit Strong
Tamiya's Mark Fit is a decal softener in the same family as Micro Sol. The Strong version is designed for thick or stubborn decals that will not settle with milder solutions. It can be too aggressive for very thin decals, so test it on a spare decal from the sheet, such as an unused marking option, before using it on the main insignia.
Tamiya Mark Fit Strong Decal Setting Fluid
A strong setting fluid for decals that refuse to settle over large rivets, cast textures or compound curves. Apply it sparingly, then leave it alone to work. Test it first on a spare marking.
Check price on AmazonTip: Do not mix different brands of setting solution on the same decal in one session. Let one dry fully before applying another, or you risk dissolving the film.
Step 4: Place and settle the decal
- Brush a little Micro Set or water on the spot where the decal will go.
- Hold the backing paper next to the spot and slide the decal off with a soft, wet brush. Do not lift the decal off the paper with tweezers.
- Nudge it into position with the wet brush. If it sticks too early, add a drop of water underneath.
- Once it is right, gently press out the water from the center to the edges with a rolled-up tissue or a cotton swab. Roll; do not wipe.
- Brush Micro Sol or Mark Fit over the decal and leave it alone.
- After it dries, check for areas that have not settled. Apply another coat of softener if needed. Stubborn decals may need three or four applications.
Problem areas
Panel lines. After a coat of softener, run a fresh knife blade along the panel line through the softened decal. Then apply more softener. The decal will sink into the line and look painted on.
Hatches and moving surfaces. On a Sherman's turret or a fighter's control surfaces, the decal spans a gap. Let it settle, then slice along the gap with a sharp blade.
Rivets and weld seams. These need repeated coats of softener. Prick any bubbles that form over rivets with the tip of a fresh blade, then add more softener.
Compound curves. Large decals over rounded noses or wing roots may need small cuts at the edges to let them fold without wrinkling. Make radial cuts from the edge, never through the printed design.
Tamiya P-51D Mustang, 8th Air Force
Tamiya Messerschmitt Bf109G-6
Tamiya Mitsubishi A6M5c Zero
Choosing a marking option
Many kits include markings for two or more real vehicles or aircraft. Pick one before you paint, because the options often differ in color scheme as well as numbers. Read the small print in the painting guide: it usually names the unit, the location and the date. That date matters. An 8th Air Force P-51D, for example, may call for black and white invasion stripes if it represents a fighter from the weeks around D-Day in June 1944. Those stripes were usually painted on, often quickly by ground crews, so many modelers paint them with masking tape instead of using decals, and slightly uneven edges are accurate.
Spare decals from unused options are useful. They make good test pieces for a new setting solution, and they can replace a marking you damage.
Fixing common problems
| Problem | Likely cause | Fix |
|---|---|---|
| Silvering visible after drying | Air trapped under film, usually from matte paint | Prick the area several times with a fresh blade tip and apply softener. It wicks under and pulls the film down. |
| Decal cracks into pieces in water | Old or brittle decal sheet | Brush a liquid decal film coat over the sheet and let it dry before cutting. Test one first. |
| Decal folded on itself | Lifted or dropped while wet | Float it back flat with plenty of water on the model, then tease it open with a soft brush. |
| White residue around the decal | Dried glue | Wipe gently with a damp cotton swab after the decal is fully dry. |
| Decal in the wrong place after drying | Placement error | Apply water or softener and wait. Often you can move it a little. If not, remove it with tape and replace it. |
Step 5: Seal the decals
Decals are fragile until sealed. Wipes, washes and even handling can lift the edges. Once they have fully dried, ideally overnight, spray another light gloss coat over them. This locks them in place and lets you apply washes and weathering safely.
When weathering is done, a final matte or satin coat unifies the sheen of the whole model. Any remaining hint of carrier film usually disappears under this coat, because the decal and the paint now share the same surface finish. For more on finishing coats, see our tank painting guide.
Quick answers
Do I really need a gloss coat for decals?
Yes, if you want them to look painted on. Decals on matte paint almost always silver. Many acrylic paints are satin or matte, so a gloss varnish is the standard first step.
What is the difference between Micro Set and Micro Sol?
Set goes under the decal and helps it stick and lie flat. Sol goes on top and softens the decal so it conforms to panel lines and detail. Most modelers use both.
My decal wrinkled after I applied Micro Sol. Is it ruined?
Usually not. Wrinkling is part of the softening process. Leave it alone and it should flatten as it dries. Touching it while soft is what ruins decals.
Can I use decals from an old kit?
Often yes, but test one first. Older decals can be brittle and may yellow or crack. A coat of liquid decal film over the sheet can hold them together.
How long should I wait before sealing decals?
Let them dry fully, preferably overnight, before the sealing coat. Spraying over damp decals can trap moisture and cause clouding.
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