How can I apply a plaster coating to my old metal vent hood?

I do not think Plaster will hold up. You could build a wooden box around the vent. I covered everything surrounding my vent hood with plastic and sprayed it with Rustoleum hammered look paint. It has lasted several years.

How are you going to clean painted plaster? It’s not scrubbable. Kitchen Vent hoods get grease laden vapors all over them.

Consider screwing galvanized sheets cut to size with stainless tech screws.

If you want “color”, you can paint galvanized, after you use vinegar bath on it and then Prime it with aerosol primer & then enamel paint it. Then screw in with the tech screws.

Think about & mark the screw pattens, first. You’ll be best off punching the starter hole & tapping it with a smaller bit. S/S Tech screws have a cutting tip, FYI.

Treat yourself to a $6 can of Rustoleum Appliance paint in the Stainless Steel Finish. Take the hood down, get it super clean & paint it, 2 full coats, after priming.

you'd have to use heavy duty construction adhesive and tie wires coming in thru back/interior of hood/metal to the front where they would not be seen. so you'd have to drill tiny holes to get the wires thru. let me rephrase what I'm thinking place lathe over exterior of hood attach with adhesive to hold in place while attaching the wire ties, then from interior feed tie wires thru from inside of hood to outside / front and twist around the lathe for more secure attachment.wire ties should be 6-9"s apart and all over since you won't be using any other screws or nails.you need corner beads along edges and really need to get plaster thickness finish even to prevent its cracking later. I think it would be much easier to take hood down,prep, prime and spray paint with textured metal paint,also no risk of it cracking over time and coming off. most plastering is done over wood,drywall,concrete,brick.... However nothing is impossible and plaster wipes off easily here's from one person"I am using the plaster finish all over the kitchen because it's such a forgiving surface. It's really just a quick wipe down to clean and the walls are so lovely and rich. Plus they feel like silk :) Mine will be a little less rustic than lynne's, but either way, the finish is really a breeze to clean up :)"

Applying anything to this metal surface directly will end up being a mess.

Thank you.... As it's only me and I'm not that spry anymore, I think I will just be painting it … lol