What should technicians use to evenly distribute a sealer on a carpet's cut edge?

The most suitable method for evenly distributing a sealer on a carpet's cut edge involves using one's thumb and finger. This approach allows technicians to manually control the application of the sealer, ensuring that it thoroughly penetrates the fibers and adheres well to the cut edge. The tactile feedback received from using fingers helps in applying the right amount of pressure and controlling the quantity of sealer used, which is crucial for achieving an even coat.

While tools like a paintbrush, applicator pad, or small roller can be effective in various applications, they may not provide the same level of precision and control when working with the delicate edges of carpet fibers. The manual method allows for finer adjustments, helping to prevent over-saturation or uneven applications that could lead to an undesirable finish or potential damage to the carpet.