I need a SUPER durable clear coat for these chairs.

They will be used in my elementary classroom extensively. Since I used craft paint, I am afraid they might smear if I use a paint-on coat so I am looking into a spray. I think Krylon or Rustoleum may not be the way to go on these. They may require many coats to provide a thick protection. Any ideas? Thanks!
q i need a super durable clear coat for these chairs
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