We bought stone veneers to hang on an interior wall. According to the manufacturer's instructions, you install them directly to the wall using only tile mortar. Seems simple enough, except that we have a piece of drywall that we hung backwards (we were originally just going to finish and paint the wall, so hanging it backwards wasn't going to be a problem). Now that we are installing stone veneers on the wall, will the backwards drywall be an issue? We primed it...
That should not be a problem if the manufacturer states that you can apply over drywall. Personally I would not install stone veneer over drywall. I have installed several sq ft and have always used a scratch coat or lathe wire and mortar to affix. If they recommend this alternative installation I would at least use a light sandpaper and scuff the primer and paint first.
Actually the back side of drywall is a thicker surface - if the stone manufacturer says that you can install the stone veneer on drywall, then you can certainly install it on the back side of drywall.