Best Fillers for Scale Modeling

1. Epoxy Putty - Best for sculpting and large gaps

Epoxy putties come in two parts you knead together. They cure slowly, allowing sculpting and shaping.

Popular types: Milliput, Green Stuff, Aves Apoxie Sculpt
Best for:

• Large gaps
• Organic shapes (figures, muscles, cloth folds)
• Rebuilding missing detail
• Smoothing seams on resin kits

Why it’s great:
You can smooth it with water before it cures - often eliminating sanding entirely.

2. CA Glue (Super Glue) - Best for thin gaps and crisp edges

CA glue is one of the most versatile fillers in the hobby. We recommend AMMO Black Slow Dry CA Glue

Best for:

• Hairline seams
• Small to medium gaps
• Areas that need re‑scribing
• Hard edges (armor plates, aircraft panels)

Why it’s great:
It sands extremely smooth and doesn’t shrink.
Mix with talc or baking soda for a thicker, sandable paste.

3. Liquid Putty - Best for small to medium or shallow gaps

These liquid putties formulated with organic solvents are easy to apply and clean up.

Popular types: AMMO by Mig Jimenez makes Thin, Medium & Thick formulas
Best for:

• Small to medium seams
• Gaps around hatches or cockpit frames
• Quick fixes

Why it’s great:

·        Shrinkage: Does not shrink after application.

·        Drying Time: Can be sanded and painted after 24 hours of drying.

·        Application: Easy to spread with the included mini brush; works well for small dents, scratches, or gaps.

·        Finish: Once sanded, it integrates well with the model surface for a smooth, paint-ready surface

4. Acrylic Putty - Best for large gaps

This easy‑to‑use acrylic filler ideal for filling gaps, seams, and surface imperfections. It dries quickly, sands easily, and adheres well to plastic, making it perfect for model preparation before painting.

Popular types: AMMO by Mig Jimenez, Tamiya
Best for:

• Medium gaps
• Plastic kits
• Areas that will be sanded smooth

Pro Tips

• Use a damp brush immediately after applying to blend edges
• Apply in thin layers for best results
• Let it cure fully before priming if you want a flawless finish

Why it’s great:
It dries fast, strong filling and sands easily, no shrinking if applied correctly.

5. Sprue Goo — Best for plastic‑to‑plastic repairs

Sprue goo is made by dissolving leftover sprue in liquid cement.

Best for:

• Large seams
• Structural repairs
• Filling sink marks
• Areas needing re‑scribing

Why it’s great:
It becomes actual plastic when cured, so it sands and scribes perfectly.

Which Filler Should You Use?

Pro Tips for Perfect Filling

• Overfill slightly—sanding will level it.
• Let fillers cure fully before sanding.
• Use sanding sponges on curves to avoid flat spots.
• Prime early to check your work.
• For figures, sculpt epoxy putty before it cures to avoid sanding.