Outside?
Wind will blow stuff into it. The best finish I ever made took the most time.
Your best fast finish may be to paint your first layer of paint and sand in between coats with 600 or finer grit wet/dry sand paper. Put your part in a box (metal or substantial wood, not cardboard ) with a light bulb, watch it close as the temperature can get real hot. We made a box out of wood and wired a temperature switch inline with the power. We lined it with refractory material to keep heat in, but even aluminum foil would be good.
Works good for small parts here, but it is also very arid here. A clear coat won't make up for any sloppy paint work, that us why it us best to paint several thin coats and sand in between.
(If you haven't done it, it seems crazy to sand a new layer of paint. It works wonders with the quality of your finish)
Chilly
By the way, we built a box for baking the paint even though I gave a 25"×50"× 13" electronically controlled kiln. It worked well.