Spray Primers for 3D Printing – Aerosol Primers and Fillers

It is possible to paint 3D prints with a brush, airbrush, gun, or even an aerosol.

In the STARDUST 3D range, we present several primer or undercoat solutions in aerosol format (Spray).

Preparation : An Essential Step!

Before painting figurines and other 3D printed parts, it is advisable to carefully prepare the surface (post-processing) to achieve good adhesion and, most importantly, a perfect finish without defects once the paint is applied.

► Finer aerosol primers are preferred for collections of figurines or miniature figurines for board games, or our acrylic primers for airbrush

► For large-scale printing of mechanical parts, various accessories, toys, Cosplay, we use fillers, thick primers to be sanded.

Our Various Primers and Undercoats for 3D Printing

We distinguish between surfacing primers, mainly designed to fill and level, and fine primers, aimed at ensuring adhesion directly without sanding. All our aerosol primers are solvent-based and flammable, to be used while respecting safety instructions.

STARDUST 3D aerosol primers are known for better adhesion and faster drying. They are easier to sand compared to acrylic primers. They also provide more thickness and, therefore, better coverage than acrylic primers.

Primers are not sufficient to cover significant defects. In such cases, preliminary sanding, application of filler, or resin is necessary (see instructions at the bottom of the page).

1K Filling Primer – Gray SPR-P440 Fast

Fine thickness (15µm dry per coat, i.e., 0.015mm), ultra-fast

Available in light gray color

Application : Apply 1 to 2 coats, with a 5-minute interval.

Drying at 20°C : 20 minutes per coat

2K Filling Primer - 5 Opaque Colors SPR-P410

Significant thickness (35µm dry per coat, i.e., 0.035mm)

2-component product : aerosol with one-time-use hardener.

Available in pure white, pure black, RAL 7016 gray, 7035 gray, 7040 gray

High filling power. Fast drying, very easy to sand.

Creates a perfectly smooth and soft surface. Covers all indentations, holes, and streaks.

Application : Engage the hardener. Apply 1 to 3 coats, with a 5-minute interval. Use within 2 hours.

Drying at 20°C : 30 minutes per coat

Primer for Plastics – Transparent SPR-P230

Ultra-fine thickness (10-15µm dry per coat, i.e., 0.01mm).

Adheres directly to most plastics.

Application : Apply 1 coat.

Drying at 20°C : 5 minutes

Cover within 5 minutes with a paint coat.

Primer for Resins REPAINT – Transparent SPR-P540

Ultra-fine thickness (10-15µm dry per coat, i.e., 0.01mm)

Adheres directly to most resins.

Cover within 15 minutes with a paint coat.

Application : Apply 1 to 2 coats.

Drying at 20°C : 15 minutes.

Surface Finishing on FDM PLA or Resin Prints

It helps eliminate defects (print lines/layers, supports).

For medium and large-sized parts, here is the sequence of steps :

• Sanding 240/320

• Sprayable or potted filler

• Sanding 320

• Filling primer

• Sanding 500

• Painting

► Manual sanding is done with abrasive papers ranging from P240 for major defects to P500 before painting.

► Applying a primer allows filling with a self-leveling or sandable coat. It also creates a homogeneous color background (black, gray, white...)

Resin Prints :

The surface appears smooth and ready for painting, but defects become visible once colors and clearcoat are applied.

For highly detailed miniatures or tabletop game figurines where sanding is not feasible, applying a very thin primer that directly adheres without covering print details is suitable.

PLA Filament Prints :

Defects are more prominent, and the parts are larger, making them suitable for sanding and applying filler or primer.

Ensuring Adhesion :

When planning frequent handling or transportation of parts or miniatures, sanding and/or using an adhesion primer is essential to ensure long-term durability.

Sanding is done with abrasive paper, and for parts with intricate relief, a gray abrasive sponge is recommended.