HI Tehani,
I painted a enclosure with oil paints.
My misss panite a waterfall and stuff, after this was done I coated the whole enclosure with a Water based sealer from Wattyl(sorry cant remember the name) and then left it for 2 weeks to air out.
I also did the same with a similar enclosure but this was unassembled and this worked outr better for ventilation(duraton of ventilation was 2 days)