Mr. Color C306 Semi-Gloss Gray FS36270: Painting Guide
By Newtype: Gundam Model Kits / Gunpla / Paint / Tools | Published: 2026-10-26
Category: How-to Guides
Learn how to paint with Mr. Color C306 Semi-Gloss Gray FS36270. Get the right airbrush thinning ratio, application tips, and common mistakes to avoid for a smooth military gray finish.
Quick Answer
For Mr. Color C306 Semi-Gloss Gray FS36270, thin it roughly 1:1 to 1:1.5 with Mr. Color Leveling Thinner for airbrushing, and apply 2-3 light coats for a smooth semi-gloss military gray finish.
Why FS36270 Gray Works for Military and Gunpla Builds
FS36270 is a standard Federal Standard color used on modern military aircraft and vehicles. Mr. Color C306 replicates this gray with a semi-gloss sheen, making it a versatile choice for realistic panel lines and weathering.
The semi-gloss finish sits between flat and gloss: it reduces glare without being completely matte, which helps decals adhere well while still allowing a subtle# natural reflection. This makes it a practical base for both aircraft models and Gunpla customs that need a military look.
Trade-Off: Semi-Gloss vs. Flat or Gloss
Semi-gloss is a compromise. If you want the flattest possible finish for scale realism, you may need a topcoat. Conversely, if you plan heavy weathering with enamels or oils, a glossier base is easier to work with. C306's semi-gloss is a middle ground that works well for most applications.
Step-by-Step Painting Guide
- Prepare the surface: Wash parts in warm soapy water to remove mold release, then prime with a fine gray or white primer. Let it dry completely. A clean, primed surface prevents paint from beading or chipping.
- Thin the paint for airbrushing: Mix Mr. Color C306 with Mr. Color Leveling Thinner at a 1:1 to 1:1.5 ratio (paint to thinner). Stir thoroughly until the mixture is the consistency of milk. Too thick causes orange peel; too thin causes runs. Test on a spoon first.
- Set your airbrush pressure: Use 15-20 PSI for detail work or 20-25 PSI for larger surfaces. Keep the nozzle about 10-15 cm from the part. Lower pressure gives finer control but may require more coats.
- Apply thin, even coats: Spray in light, sweeping passes. Build up color with 2-3 thin coats, waiting 5-10 minutes between each for the solvent to flash off. Don't try to cover in one heavy coat—this causes pooling and drips.
- Clean up and cure: After the final coat, clean your airbrush immediately with Mr. Color thinner or dedicated cleaner. Let the part cure for at least 24 hours before masking or handling. Proper curing prevents smudges and makes masking safer.
Product Facts
- Mr. Color C306 Semi-Gloss Gray FS36270 10ml: Mr. Color paints are known worldwide for delivering an excellent finish and are suitable for painting most models. You can trust C306 to level smoothly and give consistent coverage on Gunpla parts, whether you brush or airbrush.
Mr. Color C306 Semi-Gloss Gray FS36270 10ml
