What kind of finishing sealant to use for bucket?

Hello everyone,
I have a quick question, what kind of sealant should I use for my bucket when I am done painting it? Or is there anything I could apply to the bucket so it coats and protects the paint? I don't want anything that will leave a glossy finish. I am not familiar at all with sealants so any and all suggestions are welcomed, please be specific also and include brand names.

Thank you!