Do not ever use an exterior coating in an enclosed space
The exteriors are made with chemicals the manufacturers assume will be "off-gassed" into the atmosphere of the...well basically the entire earth over time
They do not count on people using them for interiors, where they "off-gas" into an enclosed space much, much, smaller than "the sky"
For interior coatings, it's a tough call
The shinier sheen will be more wash-able, but will show more defects in an area usually not plastered to interior specs
I'd recommend a commercial/builder's grade primer and topcoats
Flat, if you've got lots of imperfections, eggshell if you want a little more wash-ability