Hey Pam! Yes, plaster can be sealed. It's typically done before you paint, and it's recommended to make the plaster less absorbent. This also helps the topcoat adhere better.

However, it sounds like you're looking for more of a post-process sealant to prevent scuff marks, which might be difficult to accomplish given the location of the bar. Assuming your walls are made of exterior plaster, they should be able to clean easily when scuffs happen.

We wish you the best!

Thank you. The outdoor kitchen is smooth stucco with burnishing in it so it isn’t solid white. I found a product by GALZE ’N SEAL PRODUCTS INC. It is a water based product that repels dirt and stains. I’m going to research this product and hope it works.