Built myself a new workshop, getting ready to insulate. The wall construction is 2 x 6, Tyvek, and T 111 with high quality exterior acrylic latex primer and top coat. The Tyvek is well detailed with lots of tape, well air sealed. I’ll be using R-23 Rockwool and then 1/2″ drywall. Heat will be a ceiling mounted high effencient forced air gas heater. I live in Zone 5 (SE Michigan). For a vapor barrier, will one coat of interior oil primer and two coats for latex interior do the trick? Do I even need to worry about a vapor barrier?
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I wouldn't bother with the oil primer. You should be fine with a PVA drywall primer (cheap and really good at evening out the difference between how the paper and the mud absorbs paint) followed by wall paint. For my own shop, I mixed together all the leftover paint I'd collected over the years and came up with a nice beige. Solved a couple of problems at once.