Finishing Guide

Before You Begin

Most raw 3D printed products may show visible layer lines. These are a normal part of the manufacturing process and can be removed with proper finishing techniques. We recommend working in a well-ventilated area while wearing appropriate safety equipment such as safety glasses, gloves, and a dust mask.

Tools You’ll Need:

Sandpaper

• 120 grit (initial shaping)
• 220 grit (smoothing)
• 320 grit (refining)
• 400–600 grit (final finish before paint)

Recommended Supplies

• Plastic filler or glazing putty
• Filler primer
• Spray primer
• Spray paint or acrylic paint
• Clear coat (matte, satin, or gloss)
• Masking tape
• Hobby knife
• Sanding sponge

Step 1 – Dry Fit the Parts

Before gluing anything:

• Remove any support material.
• Test-fit every piece.
• Ensure all alignment points fit properly.
• Lightly sand joining surfaces if needed.

Never force parts together.

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Step 2 – Gluing Parts Together

For most prints we recommend:

Best Adhesives

✔ Thick CA (Super Glue)

✔ Two-Part Epoxy

✔ Plastic Epoxy

Use only a small amount of adhesive to avoid excess squeeze-out.

Hold the parts together until fully cured according to the adhesive manufacturer’s instructions.

For larger helmets or armor pieces, clamps or masking tape can help keep parts aligned while the adhesive cures.

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Step 3 – Filling the Seams

Once the glue has cured:

• Apply glazing putty or filler to any seams.
• Allow it to dry completely.
• Sand smooth with 220–320 grit sandpaper.
• Repeat if necessary until the seam disappears.

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Step 4 – Sanding

Begin with coarse sandpaper to remove print lines.

Recommended progression:

120 → 220 → 320 → 400 → 600 grit

Do not over-sand fine details.

Use sanding sponges for curved surfaces.

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Step 5 – Apply Filler Primer

Spray several light coats of filler primer.

Allow each coat to dry according to the manufacturer’s instructions.

Lightly sand between coats using:

320–600 grit

Repeat until the surface becomes smooth.

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Step 6 – Painting

Once the surface is smooth:

1. Apply a standard primer.
2. Allow it to dry completely.
3. Apply multiple light coats of paint.
4. Allow adequate drying time between coats.

Avoid applying heavy coats, which can cause runs.

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Step 7 – Clear Coat

Protect your finished prop with a clear coat.

Choose the finish that best suits your project:

• Matte
• Satin
• Gloss

Allow the clear coat to cure fully before handling.

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Weathering (Optional)

For a realistic appearance, consider adding:

• Dry brushing
• Black wash
• Metallic highlights
• Battle damage effects
• Rust or dirt effects
• Airbrushed shading

Apply weathering gradually until you achieve the desired look.

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Safety Tips

• Wear eye protection when sanding.
• Use a respirator or dust mask while sanding or spraying paint.
• Work in a well-ventilated area.
• Keep paints and adhesives away from children and pets.
• Follow all safety instructions provided by the manufacturers of your materials.