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Did you layer it? I have learned in the past it’s a one and done project. If I attempt to add more layers, it comes out milky and peels easily. I also do not sand after unless I really over filled it. Just put a small round of Mylar about the size of a penny or nickel (depending) over it. The Mylar keeps the polycrylic from wearing off.
What polycrylic are you using? Matte, Satin, Semi-Gloss, Gloss? Did you shake the can before applying? Tiny air bubbles may also cause milking.
Quoted from megadeth2600:Is there any chance there was wax buildup on the inserts? If so, you may want to clean them up with naptha before applying it (though I am sure you know that already).
While this is unlikely, you might be using a bad batch of the Polycrylic. Are you sure the stuff you are using is actually good?
What he said, Polycrylic is usually good for only 9-12 months once opened.
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