Quick Answer
Your Vallejo Metal Medium may appear dull or uneven because it lacks a glossy binder. Mixing it with Vallejo Gloss Medium restores the reflective luster and improves flow.
Why Metal Medium Alone Can Look Flat
Vallejo Metal Medium is designed to add a metallic sheen when mixed with acrylic colors, but on its own it can dry with a slightly matte or grainy surface. This is because the metallic particles need a glossy binder to reflect light evenly. Without that binder, the finish can look dusty or uneven, especially over dark primers.
Gloss Medium solves this by increasing the fluidity and transparency of the mix, allowing the metal flakes to settle into a smoother film. It also heightens flexibility and adhesion, which helps the metallic layer bond to the model without cracking.
When to Skip This Mix
If you want a satin or matte metallic finish for a weathered or non-reflective look, skip the Gloss Medium. You can also apply Metal Medium straight from the bottle for a pure silver iridescent effect—just be aware the surface may be less glossy than expected.
For high-shine areas like armor blades, visors, or jewelry, the Metal Medium + Gloss Medium blend is your best bet.
Diagnosis & Fix
- Symptom: Your metallic paint dries with a chalky, dusty, or uneven shine, especially over dark primer.
- Likely Cause: Vallejo Metal Medium lacks a glossy binder on its own. The metallic particles need a reflective medium to align properly. If the paint looks fine to you, you may not need this fix.
- Corrective Action: Mix one part Vallejo Gloss Medium with two parts Vallejo Metal Medium on a palette. Stir gently until combined. Apply in thin coats over a smooth base. Test on a spare model or sprue first to confirm the shine level.
- When to Stop / Choose Another Option: If you want a matte metallic finish or a pure silver effect, use Metal Medium alone. If the mix still looks dull, your base layer may be too rough—sand or prime again.
Product Facts
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Vallejo - Metal Medium (18ml): This product can be mixed with acrylic colors to create an iridescent luster. It can also be applied by itself for a silvery iridescent effect. When used alone, the finish may appear dull on dark surfaces; adding Gloss Medium improves reflectivity.
Vallejo - Metal Medium (18ml)
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Vallejo - Gloss Medium (18 ml): Gloss Medium extends acrylic colors, increasing their fluidity and transparency. It heightens flexibility and adhesion, and does not yellow or change color tone. It provides the glossy binder needed to make the metallic particles shine and improves paint flow for smoother application.
Vallejo - Gloss Medium (18 ml)
