Matsubo Tech Blog 
Painting Keychron keyboard frame with WR blue mica
Background
I bought a Keychron K6 keyboard. Out of the box, the appearance is plain — two-tone keycaps and a single red escape key on an otherwise all-dark frame. Functional, but not exciting.
While checking typing sound comparison videos on YouTube, I came across this one:
The painted frame looked so good that I decided to give my keyboard a custom paint job too.
Color choice: WR Blue Mica
WR Blue Mica is the iconic color of Subaru’s WRX STI rally cars. It’s a deep blue with metallic flakes that shifts subtly in different lighting. Subaru enthusiasts will recognize it instantly.
I chose this color because:
- The metallic blue would contrast nicely with the dark keycaps
- The red escape key would pop against the blue (Subaru rally vibes!)
- Automotive-grade spray paint is durable enough for daily use
Materials
Silicon remover
Removes oils and contaminants from the metal surface so that paint adheres properly.
ソフト99(SOFT99) 99工房 補修用品 シリコンオフ...
生産国:日本
Primer and surfacer spray
The frame is aluminum, so a primer is needed to give the paint something to bond to. Without it, the paint will chip off within days.
ホルツ ペイント塗料 プラサフ グレー 300ml Holt...
車の金属ボディーや、アルミ製品の下塗りに、最も適しています。パテ仕上げ面の細かいキズを埋め、密着性・耐久性に優れサビを防ぎます。乾燥後の研磨も容易です。補修塗装や、塗り替え時の下塗りとしてもご使用下さ
WR Blue Mica spray
The star of the show. This is the actual Subaru WRX color code in spray can form.
ホルツ 純正塗料スプレー カーペイント スバル車用 02C ...
防錆効果・耐候性・光沢が抜群、ボディーだけではなくバンパーにも最適。自動車メーカー純正色に合わせて調色しています。
Clear coat
WR Blue Mica contains metallic flakes, so a clear coat is required to protect the finish and give it a smooth, glossy surface.
ホルツ ペイント塗料 クリアペイント A-4 300ml H...
メタリック、パール、マイカカラーの仕上げ用の透明な艶出し塗料。 紫外線や酸性雨などから保護しツヤ・光沢を高めます。 ボディはもちろんバンパーにも最適な塗料です。
Total material cost was about 4,500 JPY. Since each can has enough paint for several projects, the per-keyboard cost is roughly 1,000 JPY.
Painting process
Overview
- Clean with silicon remover
- Apply primer + surfacer
- WR Blue Mica × 2 coats
- Clear coat × 2 coats
Allow 10–15 minutes of drying time between each coat.
Step 1: Primer
After cleaning the frame with silicon remover, I applied the primer + surfacer. This creates a uniform gray base for the color coat.
Step 2: Color
Two coats of WR Blue Mica. Light, even passes from 15–20 cm distance to avoid drips. The metallic flakes start to shimmer after the second coat.
Step 3: Clear coat
Two coats of clear to seal the metallic paint and add gloss.
Result
I also painted the bolt heads with black metallic paint for a cleaner look.
The contrast of the red escape key against the WR Blue Mica frame turned out great. It’s giving off Subaru rally car energy.
Happy hacking!
