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Hey Guys! Been MIA on here for a while...

I'll be installing Robinson Thin Brick over PAINTED sheetrock in a condo. I've done plenty of thin brick, but never over painted sheetrock.

Here are my 3 methods that I'm weighing out:

Option #1 (BEST): Lathe, scratchcoat, install thinbrick with thinset

Option #2 (2nd Best): Install 1/2" CBU over sheetrock, float joints, install thinbrick with thinset.

Option #3 (worst, but passable): Sand the crap out of the painted sheetrock, and install thinbrick with modified thinset.

Do you guys have any feedback on which one would be best in this application?
 

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On a similar note, one of my contractors wants me to put up a rough textured plaster on interior walls. On a previous project (not by me) they used regular buff mortar mix over lath to get the effect. Is the lath necessary? Should we use blueboard as a substrate? Primer? Glue in the mix? :sad:
 

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There are products out there to achieve that without lathing. LaHabra Plaster Mix is one, but there are others, both cementious and acrylic.

As a rule, you trowel on the base coat over whatever is there, then apply the finish coat, smooth or rough, from Tuscan to Venetian.
 
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