For anyone who is serious about doing this... it suggests using a latex primer on the instructions. But it specifically says it's for "new drywall". It says drywall that is already painted doesn't need a primer.
I think it absolutely does need a primer.
I didn't use one, and I think it would have been a lot better if I had both sanded the shit out of my drywall to remove the texture, AND used a primer. I think I can see a bit of my existing paint under the Rust-Oleum white board paint. And I used every last drop to cover a 5' x 5' portion of the wall. Said it should cover up to 7' x 7'.
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