3D scale car model making for exhibition display

Glass fiber reinforced plastic car model maker

1. Mold making: Precisely replicate the body contour

Master mold sculpting: Based on the actual car, a 1:1 body master mold is sculpted using high-density foam, with a focus on reproducing the front end streamline, waistline curvature, and rear end features. The surface is repeatedly scraped and sanded with putty until it achieves a mirror-like finish, ensuring no dents or protrusions.

Mold Overlay Processing: Apply a uniform layer of release agent on the surface of the master mold, lay down glass fiber cloth and unsaturated polyester resin in 3 layers, and lightly sand each layer after curing to enhance mold strength. After the overall curing for 24 hours, disassemble the mold and trim the edges to form a bilaterally symmetrical exterior mold of the vehicle body.

II. Glass fiber reinforced plastic molding: integral casting and detail shaping

Main body casting: Mix the prepared resin and glass fiber in proportion, pour them into the mold, and use vacuum negative pressure technology to eliminate bubbles, ensuring that the material closely adheres to the inner wall of the mold. After curing for 8 hours, demold to obtain the rough body. At this point, it is necessary to check the surface for pinholes or cracks, repair them with putty, and then polish again.

Component separation system: Movable components such as car doors and engine hoods are individually molded and produced, with hinge installation slots reserved at the edges. The window frames are hand-shaped using thin fiberglass strips, and after being spliced with the main body of the car, they are bonded with resin to ensure that the gap is less than 0.5mm.

III. Surface treatment: from rough grinding to mirror effect

Coarse grinding and fine grinding: First, use 80-grit sandpaper to remove the mold release marks from the body blank. Then, use 400-grit sandpaper to grind the curved transitions. Finally, use 1000-grit sandpaper for overall fine grinding until the surface feels smooth and free of granular texture.

Primer and topcoat: Spray epoxy primer to seal the fiberglass surface, and after drying, apply fine putty to level minor imperfections; choose high-adhesion automotive-specific blue paint for the topcoat, spray thinly in 3 coats (with a 30-minute interval between each coat), and finally apply a layer of varnish to increase glossiness, simulating the texture of real car paint.

IV. Detail assembly: Metal parts and functional simulation

Wheel hub and headlights: The metal wheel hub is processed and shaped on a lathe, and its surface is electroplated in silver before being fitted with rubber tires. The taillights are carved from red acrylic plates, with LED strips embedded inside. They are connected to a power source through hidden wiring to achieve the lighting effect.

Chrome-plated trim strip: A 0.3mm thick metal chrome-plated strip is pasted under the car door and on the window frame. It is slightly heated and shaped with a heat gun to ensure a perfect fit with the body's curved surface, restoring the original metal decorative details of the car.

Leveraging the high-strength properties of fiberglass material and handcrafted shaping techniques, the model not only achieves over 90% appearance replication but also boasts excellent structural stability, making it suitable for long-term display