Which type of sealant comes in a single container ready to use?

The correct choice is premixed sealant because it is readily available in a single container and does not require any additional mixing or preparation before use. This characteristic makes it convenient for quick applications, allowing users to simply apply it to the required surfaces without the need for precise measuring or mixing of components.

Premixed sealants are often used in various aerospace applications where ease of use and the need for reliable, immediate adhesion are essential. By being prepped in this way, the sealant maintains uniformity, ensuring consistent performance across applications.

In contrast, a two-part sealant typically requires the mixing of a base and a hardener before use, which adds an additional step and can introduce potential for errors in ratios or mixing. Similarly, epoxy sealants often consist of two components that need to be combined prior to application. Flexible sealant can refer to different types of sealants that may or may not be premixed, thus it does not guarantee the convenience of a single-use container. Therefore, premixed sealants represent a practical choice for tasks requiring immediate application and effectiveness.