There are really good paints out there now and every colour of the rainbow. Just do a good prep and use the right stuff and you should be good.
Is the fridge crack in a liner or shelf? Silicone doesn't sound right to me.
I would look at picking a solvent cement that was compatible with the plastic and if it's possible to access the back of the crack, add a reinforcing strip.
Per Google:
AI Overview
Refrigerator interior liners in Canada are primarily made from
High Impact Polystyrene (HIPS) and
Acrylonitrile Butadiene Styrene (ABS). These thermoplastics are chosen for their durability, low-temperature toughness, and ease of thermoforming into complex shapes. HIPS is often used for its cost-effectiveness, while ABS is used for superior structural strength and chemical resistance, particularly on liners.
Piedmont Plastics +4
Key Materials for Fridge Interiors:
- High Impact Polystyrene (HIPS): The most common material for the main inner liner and door linings, often chosen for its balance of strength and cost.
- Acrylonitrile Butadiene Styrene (ABS): Frequently used for inner door panels and high-stress areas because it is more rigid and durable than HIPS.
- Propylene-Ethylene Copolymers: Sometimes used in blends with polyethylene
- or EVA (Ethylene Vinyl Acetate) to provide improved resistance to chemicals, such as cleaning agents.
- Foamed Polyurethane: Although not the liner material itself, this is the insulating foam layer located directly behind the plastic liner.
Piedmont Plastics +3
These materials are compliant with safety standards for food-contact surfaces, ensuring they do not degrade under cold, moist conditions.
The Madison Group
AI Overview
For polystyrene plastic, the best cements are solvent-based products that "weld" the plastic by melting the surfaces together, creating a strong, permanent bond. Top recommendations include
Tamiya Extra Thin Cement (highly popular for precision),
Plastruct Bondene, and
Testors Plastic Cement. These are ideal for model kits and generally set in minutes.
ABS plastic cement is a specialized solvent, often yellow or black in color, that chemically welds ABS (Acrylonitrile Butadiene Styrene) plastic parts together at a molecular level. Unlike standard glue, it melts the plastic to create a strong, durable, and leak-proof bond for plumbing (pipes, fittings), 3D prints, and model kits. No primer is required, and it sets in roughly 30 minutes.
Oatey +4