Can You Thin Scalecoat Paint? (Complete Guide)
Yes—Scalecoat paint can and should be thinned for most applications, especially when airbrushing.
Thinning is one of the most important steps in getting a smooth, even finish on your model. Done correctly, it improves flow, atomization, and overall results. Done incorrectly, it can lead to rough finishes, poor coverage, or paint that won’t behave the way it should.
This guide will walk you through everything you need to know.
Do You Need to Thin Scalecoat Paint?
In most cases:
- Airbrushing: Yes, thinning is recommended
- Brush painting: Often no, can be used straight from the bottle
Scalecoat is formulated to be versatile, but for airbrush use, thinning helps the paint spray more evenly and lay down a smoother finish.
What Thinner Should You Use?
For best results, always use the correct Scalecoat thinner for your paint type:
- Scalecoat I Thinner for Scalecoat I paints
- Scalecoat II Thinner for Scalecoat II paints
Using the proper thinner ensures the paint maintains its intended flow, adhesion, and finish characteristics.
Avoid using generic or unknown thinners, as they can negatively affect how the paint sprays and cures.
How Much Should You Thin Scalecoat?
A good starting point is:
- 2 parts paint to 1 part thinner for airbrushing
From there, you can adjust slightly depending on your setup and preferences.
You’re aiming for a consistency similar to:
- Light cream
- Or slightly thinner than milk
This allows the paint to atomize properly without becoming too thin.
Signs Your Paint Is Too Thick
If your Scalecoat is not thinned enough, you may notice:
- Rough or grainy finish
- Poor atomization from the airbrush
- Paint spitting or inconsistent spray
- Difficulty getting smooth coverage
In this case, add a small amount of thinner and test again.
Signs Your Paint Is Too Thin
If you’ve added too much thinner, you may see:
- Runs or sagging on the surface
- Poor coverage
- Paint pooling in details
- Difficulty building color
If this happens, add a bit more paint back into your mix to rebalance it.
Airbrush Tips for Best Results
Once your paint is properly thinned, a few simple techniques will help you get the best finish:
- Apply multiple light coats instead of one heavy coat
- Keep the airbrush moving to avoid buildup
- Allow a few minutes between passes
- Build coverage gradually
This works with the paint’s natural leveling behavior to produce a smooth, even finish.
Can You Thin Scalecoat That Has Thickened Over Time?
If your paint has thickened slightly in the jar, you can often restore workable consistency by adding thinner and mixing thoroughly.
However, keep in mind:
Thinner can improve flow, but it cannot fully reverse the internal curing process that occurs over time.
If the paint has become:
- Stringy
- Rubbery
- Partially hardened
It may no longer perform well for high-quality airbrushing.
Common Mistakes to Avoid
- Using the wrong thinner
- Over-thinning the paint
- Spraying heavy coats instead of light passes
- Not mixing thoroughly before spraying
Taking a few extra minutes to get the mix right will save a lot of frustration later.
Final Thoughts
Thinning Scalecoat paint correctly is one of the biggest factors in achieving a smooth, professional-looking finish.
Start with a simple 2:1 paint-to-thinner ratio, adjust as needed, and focus on light, even coats. With a little practice, you’ll find the setup that works best for your airbrush and your style.
If you’re unsure, remember:
You can always add more thinner—but you can’t take it out once it’s in.
