How to Choose the Right Surfacer for Your Model Kit: A Beginner's Guide

Quick Answer

For most plastic model kits, a fine-grit surfacer like Mr. Hobby's Gundam Marker Basic Set or a dedicated liquid primer is the best starting point. Match the grit to your job: coarse for filling scratches, fine for a smooth base. If you're unsure, start with a 1000-grit surfacer—it works for most applications.

Surfacer, also called primer, is the unsung hero of a clean paint job. It hides small scratches, gives paint something to grip, and makes colors pop. But with so many options, how do you choose?

This guide will walk you through the basics, including grit sizes, application methods, and when to use each type. We'll also highlight a few products from Panda Hobby that make the process easier.

What Is Surfacer and Why Do You Need It?

Surfacer is a type of primer designed specifically for plastic models. It comes in spray cans, jars for brush or airbrush, and even marker form. Its main job is to create a uniform surface that paint can adhere to, while also revealing imperfections like seams or scratches.

Without surfacer, paint can pool in recesses, fail to stick, or look uneven. A good coat of surfacer also helps you see where you need to fix the surface before you commit to color. For beginners, it's the difference between a hobby-grade finish and a professional-looking one.

• Surfacer fills tiny scratches and panel lines.
• It improves paint adhesion and durability.
• It helps you spot flaws before painting.

Surfacer 500 vs 1000: What's the Difference?

The number on a surfacer refers to the grit of the particles in it. Lower numbers, like 500, are coarser and fill deeper scratches. Higher numbers, like 1000, are finer and leave a smoother finish.

For most model kits, a 1000-grit surfacer is the sweet spot. It's fine enough to be used as a base for final paint, but still has enough bite to hide minor imperfections. Surfacer 500 is better for heavy sanding marks or when you need to build up a thicker layer. Some brands also offer 1500 for ultra-smooth finishes, but that's often overkill for beginners.

• 500-grit: fills deep scratches, but may need sanding after.
• 1000-grit: all-purpose, good for most builds.
• 1500-grit: for super-smooth finishes, often used on cars.

Liquid vs. Spray vs. Marker Surfacer

Surfacer comes in three main forms: liquid (for brush or airbrush), spray cans, and markers. Liquid gives you the most control and can be thinned to your liking, but requires an airbrush for best results. Spray cans are convenient and require no extra equipment, but can be wasteful and harder to control in humid conditions.

Markers, like the GMS105 Basic Set Gundam Marker Set, are perfect for touch-ups and small areas. They're not ideal for priming an entire kit, but they're great for fixing spots you missed or for panel lining. For a beginner, a spray can or liquid with a brush is usually the best start.

• Spray cans: easy, but beware of humidity and overspray.
• Liquid: best control, but needs an airbrush or brush.
• Markers: great for touch-ups, not for full priming.

How to Apply Surfacer Like a Pro

Before you start, wash your parts in warm soapy water to remove mold release agents. Then, lightly sand the surface with a fine grit (like 800-1000) to give the surfacer something to grip. Apply thin, even coats, holding the can or airbrush about 15-20 cm away.

Let each coat dry completely before adding another. Two thin coats are better than one thick one. After the surfacer dries, inspect the surface for any flaws. If you see scratches, you may need to sand again and reapply. Once you're happy, you're ready for paint.

• Always clean parts before priming.
• Apply in thin, even coats.
• Sand between coats if needed.

Your Surfacer Decision Rules

• If you're a beginner: Start with a 1000-grit spray can or liquid surfacer. It's forgiving and works for most kits. You'll get a smooth base without much fuss.
• If you have deep scratches or seams: Use a 500-grit surfacer to fill them, then sand and top with a 1000-grit coat. This two-step approach gives a flawless finish.
• If you're working on small parts: Use a marker or brush-on surfacer for precision. Full spray cans waste paint and are hard to control on tiny pieces. You'll save paint and avoid overspray.

Products That Make Surfacing Easier

• GMS105 Basic Set Gundam Marker Set: Gundam Marker Set - Basic Set by Mr. Hobby. It includes markers for panel lining and touch-up. While not a surfacer itself, this set is perfect for fixing small imperfections after priming, like panel lines that need darkening or edges that need a clean coat.
• Acrysion N50 - Lime Green (Gloss/Primary): This is an epoch-making paint that can be used for both brush painting and air brush painting. Drying speed is faster than with the existing water based hobby colors, so work efficiency is improved dramatically. Although this is a color paint, its fast-drying formula makes it a good choice for touch-ups over your surfacer, especially if you're brush painting small details.

Which Surfacer Fits Your Project?

Best for

• Beginners who want a simple, all-purpose primer: 1000-grit liquid or spray.
• Modelers working on Gunpla or other plastic kits who need to hide panel lines and small scratches.

Not for

• Ultra-smooth finishes on car models where you might need 1500-grit or higher.
• Quick touch-ups on already-painted parts – a marker is better for that.

Choosing the right surfacer doesn't have to be complicated. Match the grit to your project, pick the form that fits your tools, and always apply in thin coats. With these rules, you'll get a clean base that makes your paint job look professional. Happy building!