What is the difference between 1K and 2K paint?

[LaMakayla]

The following are the differences between 1K and 2K paint: Related properties: 1K refers to single-component automotive paint, while 2K refers to two-component automotive paint. They cannot be mixed together. You can use 1K as the primer and 2K as the topcoat, but you must never mix 1K and 2K in either the primer or the topcoat. Mixing: 1K paint is sprayed directly after adding a thinner, following a two-step process. The mixing ratio with the thinner is 1:1, and no hardener is required. Since 1K paint dries to a matte finish, a clear coat must be applied. The clear coat is mixed with a hardener and thinner and sprayed directly onto the base color paint. This not only enhances the brightness of the 1K paint but also improves its durability. 2K paint requires the addition of a hardener and thinner before spraying, following a one-step process. 2K paint has inherent brightness and does not require a clear coat to enhance gloss. Difference in effect: 2K paint is superior to 1K paint. 1K paint only serves as a base color and provides surface protection, while 2K paint offers better hardness compared to 1K.

[VonCassandra]

I really enjoy DIY car painting, and there's a big difference between 1K and 2K paints. 1K is a single-component paint that you can spray directly onto the car body. It's easy to use and dries with sunlight or air exposure, making it perfect for fixing minor scratches—saving both time and money. However, its drawbacks are obvious: the surface isn't very hard, water spots leave marks when washing, and it starts to fade and yellow within six months. In contrast, 2K is a two-component paint. You need to mix the resin and hardener before spraying. Once it chemically cures, it becomes extremely durable—resistant to scratches and abrasions—and maintains its shine for three to five years without issue. The downside is the higher price, and you must wear a respirator and work in a well-ventilated area due to the strong fumes. After trying both a few times, I think 1K is great for beginners to practice, but if you truly want to protect your beloved car, 2K is far more reliable—at least you won't need frequent touch-ups.

[Camila]

From an economic perspective, 1K paint is cheap and easily accessible, with a basic repair costing just over 20 yuan per can, making it suitable for temporary fixes or casual DIY projects. However, it has many long-term issues: relying solely on air drying, the surface remains soft and prone to peeling when exposed to rain, requiring annual repainting, which wastes time and resources. In contrast, 2K paint involves a higher initial investment but undergoes a chemical reaction when mixed, curing quickly to form a hard, durable finish resistant to UV rays and scratches. Although more expensive upfront, it requires almost no maintenance for up to five years, making it more cost-effective overall. Especially for daily commuter cars, choosing 2K paint saves hassle and avoids repeated expenses on paint repairs. Simply put, opt for 1K if you're on a tight short-term budget, but choose 2K for long-term value—it all depends on individual needs.

[DeMaria]

Regarding safety, 1K paint has lower toxicity and less odor, making it suitable for spraying in a garage with minimal health risks. 2K paint requires mixing two chemicals and releases harmful gases, necessitating the use of a professional mask and ventilation equipment during operation to avoid serious respiratory hazards. For ordinary users, spraying 1K paint poses fewer risks and is easier for DIY projects.