I happen to like Zinsser 1-2-3 but I tell ya Joe, for your application I think any of those you mention will be just fine. All you need is a coat of primer to eliminate the possibility of your thin-set re-emuslfying the drywall compound. Doing that does not require a high-tech, stain sealing coating.
Last edited by Mike2; 08-30-2008 at 05:04 PM.
Reason: typo
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