Mr. Hobby Mr. Color Flat Base 10ml – Lacquer Flattening Agent for Models

Mr. Hobby Mr. Color Flat Base 10ml – Lacquer Flattening Agent Paint Additive

• Three Texture Options for Custom Matte Finishes – Mr. Hobby's complete Flat Base additive lineup in 10ml format: a standard formulation (C30), a coarser-particle Rough variant (C188), and a finer-particle Smooth variant (C189). Detailed selection guidance below — most builds use one of the three depending on the desired surface texture and subject matter.
• Mixed INTO Paint, Not Applied On Top – Flat Base is a flattening agent additive. You blend it into Mr. Color paint or clear coat to convert gloss or semi-gloss finishes into matte. This is fundamentally different from C181/C182/C183 Top Coats, which are applied as a final layer over completed paint work. Flat Base is a mixing component; top coats are finishing layers.
• Manufacturer-Specified Mixing Ratios – Mr. Hobby publishes precise mixing ratios for converting gloss paint to semi-gloss or matte finish — see the application guide below for the documented percentages and procedure. Higher ratios produce flatter and more textured surfaces; particle size of the specific Flat Base variant determines the final texture character at any given ratio.
• Lacquer Chemistry — Mr. Color Compatible – These additives are formulated for the Mr. Color lacquer paint family and the Mr. Color GX line. Thin the resulting mixture with Mr. Color Thinner (T101–T104) or Mr. Color Leveling Thinner (T106/T108) at standard ratios. Not compatible with Aqueous Hobby Color or Acrysion water-based lines — those have their own dedicated flat base equivalents.

📝 Product Description

The Mr. Hobby Mr. Color Flat Base lineup is the dedicated lacquer flattening agent system used by serious modelers to convert gloss and semi-gloss Mr. Color paints into custom matte finishes. The product itself is a high-concentration suspension of fine flattening particles in a clear lacquer carrier — when mixed into paint, the particles disperse throughout the cured film and scatter incoming light, breaking up the glossy reflection that wet lacquer otherwise dries to.

Why three SKUs instead of one: scale modelers don't share a single definition of "matte." A matte tank looks different from a matte figure looks different from a matte aircraft, and serious modelers want surface character to match their subject. Mr. Hobby splits the Flat Base line into three particle-size variants so builders can pick the texture profile that fits the work — coarser for weathered authenticity, finer for clean showcase finish, standard for everything in between. Detailed selection criteria are in the variant guide below.

This is fundamentally a workflow tool rather than a finished product. You don't airbrush Flat Base by itself; you mix it into your actual paint or clear coat first, then airbrush the modified mixture. The 10ml bottle holds enough additive to flatten roughly 50-100ml of paint depending on mixing ratio — practical inventory math is one Flat Base bottle per several bottles of finished paint.

🎯 Variant Selection Guide

Choose C30 Flat Base if you need: A general-purpose flattening agent for most everyday modeling work. C30 is the original formulation that has been in continuous production since the 1980s — the default Flat Base when no specific texture requirement applies. Suitable for converting any gloss Mr. Color paint to semi-gloss or matte using standard manufacturer ratios. Most builders who only stock one Flat Base variant choose C30 as the all-purpose option.

Choose C188 Flat Base Rough if you need: A drier, more textured matte finish with visible "tooth." The coarser particle size produces a surface that catches light unevenly — the visual texture of a freshly-cast resin part, sun-baked desert paint, or battlefield-weathered armor. Particularly suited for AFV (armored fighting vehicle) modeling, tank weathering, and any subject where authentic-looking rough finish supports the realism of the build. Texture intensifies at higher mixing ratios.

Choose C189 Flat Base Smooth if you need: A cleaner, more uniform matte finish without visible texture. The finer particle size produces a velvet-flat surface that holds up better to handling, photographs cleanly under studio lighting, and looks closer to traditional showcase finish. Preferred for figure painting, contest builds, automotive interior surfaces, and any subject where a polished matte look matters more than weathered authenticity.

All three variants are mixed into paint using the same manufacturer-documented ratios shown in the application guide. The choice between them is about final surface character, not workflow — application, thinning, and curing are identical regardless of which Flat Base you select.

💡 How to Use

For converting Mr. Color paint from gloss to semi-gloss, add 5-10% Flat Base by volume to the Mr. Color paint before thinning. Stir thoroughly until the suspension is uniform — Flat Base particles settle quickly, so always re-stir before each painting session. Thin the resulting mixture with Mr. Color Thinner at standard 1:1 to 1:2 ratios for airbrush application.

For converting paint to a full matte finish, increase the Flat Base ratio to 10-20% by volume. The relationship between Flat Base percentage and final flatness is non-linear — beyond 20%, additional Flat Base produces diminishing flatness gains and starts compromising paint adhesion and color depth. If your test mix at 20% isn't flat enough, consider switching from C30 standard to C188 Rough rather than pushing the ratio higher.

Always test on scrap plastic before committing to a full kit. The exact relationship between mixing ratio and final flatness depends on the underlying paint color, the thinning ratio, the airbrush pressure, the temperature and humidity during application, and whether a clear coat will be applied over the matted paint. Scrap-test once, document the ratio, then use that documented ratio across the rest of the kit — consistency across panels matters more than perfecting the absolute flatness.

Application tips: shake the Flat Base bottle vigorously for 30 seconds before each use. The flattening agent settles to the bottom of the bottle when stored, and inadequately mixed Flat Base produces uneven flatness in the final paint. Flat Base also works as an additive to Mr. Color top coats (C181/C182/C183) for custom-flatness clear finishes — useful when the standard semi-gloss or flat top coat isn't quite the right level for your build.

Always work in a well-ventilated area with a respirator rated for organic vapors. Flat Base is a lacquer-based product with the same volatility profile as standard Mr. Color paint. Spray booth or outdoor work strongly recommended.

🔧 Why Modelers Choose Mr. Color Flat Base

What makes the Mr. Color Flat Base lineup the standard reference for lacquer flattening agents — across user feedback at Newtype, Galactic Toys, USA Gundam Store, and the broader scale modeling community — comes down to three things: particle consistency batch-to-batch, predictable mixing-ratio response, and compatibility with the full Mr. Color paint range.

The particle consistency is the quiet professional argument. A bottle of C30 you bought five years ago and a bottle you buy today produce the same flatness at the same mixing ratio — important for builders mid-way through long projects who don't want surface character to shift between paint sessions. Generic flattening agents from third-party manufacturers can vary noticeably between production batches; Mr. Color Flat Base does not.

The predictable mixing-ratio response is what separates Mr. Color Flat Base from less-refined flattening additives. Mr. Hobby's documented semi-gloss and matte conversion ratios are reliable across paint colors, thinning ratios, and application conditions. Builders can dial in their preferred flatness once and reproduce it consistently — the additive does not introduce surprise variability into an otherwise controlled workflow.

The compatibility argument is structural. Mr. Color Flat Base is formulated for the Mr. Color lacquer family and works seamlessly with the full C-series paint catalog plus Mr. Color GX paints, Mr. Color Spray (when decanted into airbrush use), and Mr. Color top coats. Staying within the Mr. Color additive ecosystem eliminates chemistry compatibility questions that arise when mixing lacquer paint with non-Mr. Color flattening agents.

❓ Frequently Asked Questions

What's the difference between Flat Base (additive) and Flat Clear (top coat)?
Flat Base (C30/C188/C189) is mixed INTO paint to make it dry matte. Flat Clear (C182) is sprayed ON TOP of finished paint as a final clear coat that dries matte. Use Flat Base when you want the actual paint color to be matte. Use Flat Clear when your paint is already the right color and you just need a final matte sheen layer. Many builders use both: matte paint mixed with Flat Base, then sealed with Flat Clear top coat for added protection.

Can I mix Flat Base directly into Mr. Color top coats (C181/C182/C183)?
Yes. Adding a small amount of Flat Base (at the lower end of the manufacturer's documented ratio range) to Semi-Gloss Super Clear (C181) creates a custom flatness between semi-gloss and full matte — useful when neither C181 nor C182 is exactly the right finish level. The mixing approach works identically whether you're modifying a paint color or a clear coat.

Why are there three Flat Base variants instead of just one?
Different scale modeling subjects need different surface texture even when both are technically "matte." Tank weathering, figure painting, and aircraft modeling each benefit from a slightly different particle character in the flattening agent. Mr. Hobby provides three variants so builders can match texture to subject without compromising. The Variant Selection Guide above details the practical decision criteria for picking between C30, C188, and C189.

Will Flat Base affect the underlying paint color?
At standard mixing ratios within Mr. Hobby's documented range, the effect on color is minimal — Flat Base is a clear suspension, so it adds particles without significantly shifting hue. Above the documented range, the cumulative particle load can lighten dark colors slightly because the white-ish particles scatter light. For dark base colors where color accuracy matters, stay within the documented range and reach for C188 Rough if you need flatter surface character at that ratio.

Can I use Mr. Color Flat Base in Aqueous Hobby Color or Acrysion water-based paints?
No. Mr. Color Flat Base is formulated for the lacquer chemistry family. Aqueous Hobby Color and Acrysion lines have their own dedicated flat base products (Aqueous Flat Base, etc.) formulated for their respective water-based chemistry. Using lacquer Flat Base in water-based paint will produce poor dispersion, inconsistent flatness, and potential paint failure.

How long does an opened bottle last?
Properly capped and stored in a cool place away from sunlight, an opened Mr. Color Flat Base bottle stays usable for years. The lacquer carrier eventually evaporates and the contents thicken — when this happens, add a few drops of Mr. Color Thinner and shake vigorously to restore working consistency. Flat Base that has fully dried in the bottle cannot be revived easily.

📐 Specifications

• Brand: GSI Creos / Mr. Hobby
• Product Line: Mr. Color Flat Base Additives (C30, C188, C189)
• Formula: Solvent-based lacquer flattening agent suspension
• Volume: 10ml glass jar (per variant)
• Function: Paint additive (mixed INTO paint, not applied as a finish layer)
• Variants Available: C30 standard formulation, C188 Rough (coarser particles), C189 Smooth (finer particles)
• Mixing Ratios: 5-10% for semi-gloss conversion; 10-20% for matte conversion
• Compatible Paints: Mr. Color C-series, Mr. Color GX, Mr. Color top coats (C181/C182/C183), Mr. Color Spray (decanted)
• Compatible Thinners: Mr. Color Thinner (T101–T104), Mr. Color Leveling Thinner (T106/T108)
• NOT Compatible With: Aqueous Hobby Color (water-based), Acrysion (water-based), Vallejo, Tamiya Acrylic
• Country of Origin: Japan
• Hazard Classification: Flammable. Use in well-ventilated area with respirator rated for organic vapors. Keep away from heat, sparks, and open flame.
• Best For: Custom matte finishes on Gunpla, scale aircraft, armored vehicles, figures, and any Mr. Color paint workflow requiring precise flatness control