Hairline cracks or craquelure in the ceramics of your Kamado grill are normal and do not indicate a quality issue. These fine cracks occur naturally as a result of the ceramic glazing process and are a characteristic of the material, especially under high heat.

Here’s why it happens:

1. Glaze and Ceramic Expansion:

   • The ceramic surface of the grill is coated with a glaze during the manufacturing process. The glaze and the underlying ceramic do not always fuse together completely. This slight difference in expansion rates between the glaze and the ceramic during firing can lead to the formation of fine cracks (craquelure) on the surface.

2. High-Temperature Firing:

   • When the grill is exposed to high temperatures during use, the expansion and contraction of the ceramic material naturally causes these micro-cracks to appear. This is a common occurrence in many ceramic products, especially those subjected to extreme heat.

3. Natural and Aesthetic Feature:

   • These hairline cracks, particularly in the black or darker areas of the ceramic, can be more visible due to the color contrast. Interestingly, in Chinese ceramic art and design, these cracks are often desired and intentionally created to give the product a more unique, aged, and traditional aesthetic. This is known as "crazing", and some customers actually appreciate the distinctive look

Hairline cracks or craquelure in the ceramics of your Kamado grill are perfectly normal and do not affect the performance or safety of the product. These fine lines are a natural result of the glazing process and the high-heat environment. In fact, many ceramic artisans embrace these cracks as part of the unique character of their products.

Weather resistance features:

• Temperature tolerance: -30°F to 750°F
• All-season cooking capability
• Moisture-resistant ceramics
• Rust-resistant hardware
• UV-resistant exterior finish

Kamado grills are designed to withstand cold temperatures, but extreme freezing conditions can cause stress on the ceramic. Always protect your grill with a cover when not in use during winter months.

there are many different reasons, but it is still workable.

when transport or move the kamado ,it be hit by some goods,  and when the temperature get higher, the crack may bigger ,then you can find it .

and also,

Kamado grills may crack due to thermal shock from rapid temperature changes or improper handling. Proper care and gradual heating and cooling will help extend the life of your grill.

The black dot you see in a cracked egg on your Kamado grill is completely normal and is a characteristic of the ceramic material. This dot is usually caused by the presence of natural minerals, such as iron, in the raw materials used to make the ceramic.

Here’s why it happens:

1. Natural Materials:

   • The ceramic material used in Kamado grills is typically sourced from natural deposits, often mined from the earth. These materials can contain trace elements such as iron, silica, and other minerals that are naturally present in the soil.

2. High-Temperature Firing:

   • During the high-temperature firing process, these minerals can react with the glaze or the heat itself, resulting in the formation of small black dots or marks on the ceramic surface. The dots are a result of the minerals reacting with the glaze during the firing process.

3. Aesthetic Choice:

   • Interestingly, in traditional Chinese ceramics, these black dots are often intentionally created. The presence of these marks is a desired aesthetic, as they make each piece unique. It’s a hallmark of craftsmanship and is sometimes sought after to give the ceramic a distinct, handmade look.

Conclusion:

The black dot in the ceramic of your Kamado grill is a natural occurrence and does not indicate a quality problem. It’s caused by the minerals in the raw materials reacting during the firing process, and in many cases, this adds to the uniqueness and beauty of the product. Some ceramic artisans even aim to create these marks to make their pieces stand out as authentic, one-of-a-kind works of art.

Kamado grills themselves are made of ceramic, which does not rust. However, metal parts such as grills and ash trays can rust if exposed to moisture for prolonged periods. Regular cleaning and maintenance help prevent rust.

It’s recommended to clean your Kamado grill after every use. Regularly remove ash and grease to maintain optimal performance and prolong its lifespan.

Unlike cast iron grills, Kamado grills don’t require seasoning. However, it’s beneficial to occasionally perform a "burn-in" process by running the grill at high heat to burn off any manufacturing residues.