New Finish on Cabinet Still Sticky?

I refinished a wood/veneer china cabinet. I sanded it down the best I could. The top to the bottom piece was sanded down to bare wood and that's what's giving me the hardest time. I have 3 coats of a semi gloss enamel (with built in primer) on it. Then I took a polyurethane and stain product and "antiqued" over the paint. Most of it's fine, but the bottom section is still tacky after 3 days in air conditioning (Eastern MD).

I've refinished furniture before and never had this problem.

By Susan H