Any of those & many more can be used. The main tradeoffs are durability, fumes, cleanability, cost. Take your pick. I wouldn't rush to use pva myself. If for some reason I did, make sure its well diluted so it doesn't create a slick surface.
NT
I have to say, most people I see doing it are using external type paint, the sort you use on walls which have been rendered. If its used as a garage though, then you need something that won't flake off and make the car look like its been to a wedding. Brian
One difference is, you have to make sure the garage interior surface doesn't have mold or mildew on it. If the ceiling is a dark color, you have to make sure the surface is fit for painting.
The neighbors garage back home, was so filthy inside, you would not expect any sort of finish to stick to any of the surfaces inside. Not all garages are that dirty.
Paul
What about oil-based eggshell?
Thanks everyone - I think I will give it a go with two coats of trade emulsion
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