[Richard and Rhonda]

Tom,

I asked a Scouting buddy of mine who does faux finish for a living about this.

He said there are a couple of keys to making this work. First, use at least two coats of oil based primer on the walls to form the substrate. Oh boy, get out the fans if you use oil base in the confines of a coach.

Second, add the latex additive used to doctor paint for airless spraying, to your color base coats.

This is exactly the same advice he gave me a couple of years ago about painting over wallpaper instead of ripping it down. I did what he said, and using this technique, I did a faux over vinyl wallpaper. Two years, later and not one crack, seam, or surface irregularity.

I am assuming that you are not talking about using either sheetrock compound or Venetian plaster to put a heavy treatment on the wall. I would think that kind of texture would not deal with flexing. I do think any latex based finish will tolerate a little flexing.