Yes, it is highly recommended to seal your car's paint after using a clay bar.

Here’s why:

1. Protection: Clay barring removes not only contaminants but also any existing wax or sealant. Without a protective layer, your car's paint is more vulnerable to environmental damage, UV rays, and pollutants.

2. Enhanced Gloss: Sealing the paint after claying can enhance the shine and gloss, giving your car a more vibrant and polished appearance.

3. Smooth Finish: A sealant helps to maintain the smooth finish achieved by claying, making the surface slick and reducing the likelihood of contaminants sticking to the paint.

4. Longevity: Sealants provide long-lasting protection, often lasting several months. This keeps your car looking better for longer and reduces the frequency of needing to reapply wax or sealant.

Steps to follow after using a clay bar:

1. Polishing: If needed, polish the car to remove any minor scratches or swirls and to enhance the paint's shine.
2. Sealing: Apply a paint sealant to protect the paint and lock in the smooth, clean surface.
3. Waxing: Optionally, you can apply a layer of wax on top of the sealant for added depth and shine.

By following these steps, you ensure that your car's paint remains protected and looks its best.