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Bathroom shower wall, help!

last year

When I put the Hardie Backer Board on my shower wall it wasn't a full 1/2 inch thickness like my drywall, we had to feather the transition from drywall to backer board with joint setting compound which ran about 12 inches onto my backer board. I used primer and a satin finish paint over the compound but was just told I couldn't tile over the painted surface. I'm not sure what to do now, do I have to sand all the paint and primer off the setting compound? My transition starts from the end of my shower base and I'll be bringing tile out about 2 inches onto my drywall.

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