Care Tips: Avoiding Paint Cracking on Model Kits – Focus on HGFC Nobell Gundam

Few things are more frustrating than finishing a meticulous paint job on your model kit, only to discover fine cracks or spiderweb lines appearing days later. Paint cracking is a common issue, especially on curved surfaces, moving joints, or areas with thick paint layers. The HGFC Nobell Gundam, with its flowing hair pieces and dynamic poseable limbs, can be particularly vulnerable if not handled correctly.

In this care guide, we’ll walk through the root causes of paint cracking and share practical steps to prevent it. Whether you’re working on a high-grade kit or a simple snap-fit, these tips will help you achieve a durable, professional finish.

Why Paint Cracks on Model Kits

Paint cracking, also known as crazing or lacquer checking, occurs when the paint film loses flexibility and cannot expand or contract with the underlying plastic. Temperature changes, solvent incompatibility, and overly thick coats are the usual culprits. On the HGFC Nobell Gundam, the hair sections and shoulder joints are areas where stress is concentrated, making them prone to cracks if the paint is too rigid.

Another common cause is applying a topcoat before the base layers have fully cured. Trapped solvents continue to outgas, creating pressure that forces the paint to split. Understanding these mechanics is the first step toward a crack-free finish.

• Always test paint compatibility on a spare runner or plastic spoon before applying to your kit.

Essential Primer: The Foundation of Crack Prevention

A quality primer does more than improve paint adhesion—it also provides a uniform surface that reduces stress on the paint film. For the HGFC Nobell Gundam, we recommend using a primer that bonds well with ABS and PS plastics. The Tamiya Liquid Surface Primer (White) 40ml 87096 is an excellent choice for creating a smooth, flexible base. Its fine pigment particles fill micro-scratches without adding bulk, minimizing the risk of future cracking.

Apply the primer in thin, even coats. Let each layer dry completely before adding the next. A primed surface also helps you spot imperfections early, so you can sand or fill them before the color goes on.

Choosing Flexible Paints and Thinners

Not all paints are created equal when it comes to flexibility. Acrylic-based paints generally offer more elasticity than lacquers, making them a safer choice for kits with moving parts. When thinning your paint, use the manufacturer’s recommended thinner to avoid chemical reactions that can lead to cracking.

For hand-painted details on the Nobell Gundam’s hair or face, consider using a product like the Tamiya Chipping Liquid 87225. While it’s designed for chipping effects, it also teaches you to work with thin, controlled layers—a skill that directly reduces cracking. Avoid piling on thick paint; multiple thin coats are always better than one heavy layer.

• Stir your paint thoroughly before each use to ensure even pigment distribution and consistent drying.

Curing Time and Environmental Control

Patience is your best tool against paint cracks. Even if the paint feels dry to the touch, the solvents underneath may still be active. Allow each coat to cure for at least 24 hours in a stable environment. Avoid painting in very humid or cold conditions, as moisture can become trapped and cause the film to weaken.

For the HGFC Nobell Gundam, pay special attention to the hair assembly. These large, curved pieces need longer drying times between coats. If you’re using a clear topcoat, wait at least 48 hours after the final color layer to ensure all solvents have escaped.

Handling Joints and Articulated Areas

Articulated sections are the most common places for paint cracks because the plastic flexes during posing. Before painting, mask off pegs and joint connectors with a product like the AK8203 Masking Tape 5MM. This prevents paint from building up in friction areas where it would inevitably crack.

For the Nobell Gundam’s shoulder and hip joints, consider sanding the contact surfaces lightly to create a tiny gap. This allows the paint room to move without stress. After painting, move the joints gently a few times to break in the paint film, then touch up any small wear spots rather than repainting the entire section.

• Use a soft brush to apply paint around joints instead of spraying, for better control and thinner layers.

Paint cracking doesn’t have to ruin your model kit experience. By using a quality primer, choosing flexible paints, respecting curing times, and preparing joints properly, you can achieve a beautiful, durable finish on your HGFC Nobell Gundam and every kit after it. Explore our collection of primers and painting tools at Panda Hobby to keep your builds looking their best.