What can I use on top of acrylic paint to seal it?

I have a shelf and I painted it with acrylic paint but even though it says it's permanent, I just know that when I put stuff on it and when the humidity and heat gets to it, it will chip off, especially if I want to remove the objects from it (it'll stick to the bottom of them and rip off) so what can I use to make it so that it won't rip off like that?
 
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