I am replacing my tile back splash. When I removed the old tiles, about half of the surfaces were rocklath, while the other half was sheetrock. The sheetrock fell apart and had to be removed while for the most part the rocklath held up. I imagine I will need to skim coat it with either an extra layer of mortar or plaster first.
I replaced the sheetrock with 1/2" hardibacker. I used 1/2 plywood in a few places to even it out which fixed the majority of the unevenness but there is still a couple of places where a corner is a 1/16" high.
My question is this: Based on the two concerns pits in the plaster covering the rocklath and a few slightly uneven hardibacker tiles, can I just to a base coat of mortar and be done with it, or is this going to cause problems?