(2 Pack) OEF Furnishings Grey Shop Stool, 18” High HBRS18GY2PK

I need replacement leg caps what size help

The top part of the stool gets dirty really easily. What's the best way to clean it and do you recommend using a clear sealant on it to protect it?

Can I buy just one of these? I don't need 2 or more

Weight capacity?