Finish/sealant for unfinished wood with acrylic paint?

I’m working on a paint project with one of those cheap unfinished wooden boxes from Michael’s, and I painted over it with acrylic paint. What would you recommend to seal it? I’m going to be using it as a stash box and am trying to find a way to get rid of the stickiness of the acrylic without ruining my design. Thank you in advance!