Oops . . .
I've primed both sides of the wainscotting with Killz latex; need to prime the walls-- lots of patching.
Do I need to prime the greenboard where tile is going to go too?
Thanks.

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I suffer from the same sensitivity that you do. A few nuggets of wisdom were shared with me and I'm "trying" to incorporate them into my life. First, remember that nobody can hurt your feelings unless you let them. You can always reject what is being forced on you emotionally.
Second, nothing changes unless you change it. If you don't want the behavior to be repeated then you need to take action. Otherwise the kid has learned that his behavior is the way to get things done, because everyone lets him get away with it.
In the meantime I sympathize because I've been there.
-beerman

I would never use greenboard in any area where things might get wet (i.e. a tub/shower surround...a disaster waiting to happen. Use durock/wonderboard cement backer board instead...and no, you should not prime it. Also, make sure that the backer board does not come down and touch the tub (if it's for a tub surround). There needs to be a small gap between the tub and base of the board so that water doesn't wick its way upward and saturate the board. This gap will get caulked later.

If you have already used the greenboard, it's better than nothing, obviously.

But I agree with Dave - if you are going to keep these properties forever, then this is a REPAIR. You take the bite this year, but you'll never have to address it again for as long as you live.

Take the same approach with faucets, etc. Otherwise those $20 faucets are just repair PITA tasks 3 years from now.

Another thing learned from the guy with 60 houses (I'm sure it is well over 100 now. I've not lived near him since June '96!!)

I agree, and there is a newer board called HardiBoard HardieBacker.
It is fully waterproof (I've seen a piece sitting in water) and cuts just like sheetrock. about $10 per 3' X 5' sheet

I agree. Tear out the greenboard in tub/shower area, as painful as that will be!