u/phytosterols

i built a small cabinet w/ door for my apartment and finished both sides of all the boards with 2 coats of varathane water based poly prior to assembly (inside of cabinet also finished)... it has been about 2.5 months with the cabinet door off, but when attached a smell builds up in minutes. i cannot really detect any smell with my nose up against any of the surfaces.

is this normal? have tried leaving the entire thing outdoors/in the sun as weather permits but the smell doesn't seem to be getting better anymore. would applying heat with a heat gun help?