Sealer/varnish for story spoons

My daughter has made herself some story spoons using decoupage and acrylic paint, she would like to seal them with varnish or some sort of sealer that is non toxic and safe for children.
Can anyone recommend what she can use, they are for her own personal use in class, but just wanted to make sure they are safe just in case, little hands get hold of one.

Are they wooden spoons? How about a watered down PVA glue as a sealer. My thinking is that the PVA they use in schools is safe? x

Thanks for reply, they are wooden spoons, she had used pva so maybe thats all she needs to do, she maybe making things to complicated for herself.

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