The phrase "thin veneer" refers to a superficial or shallow appearance that disguises or covers up the true nature or reality of something. Full definition
Hardwood floor installation is a skilled job and repairs are difficult; engineered floors are easier, but still require some skill with a saw and are just thin veneers of wood or plastic. (treehugger.com)
Or is it that most of you can't stand the mere existence of people who aren't like you, and Democracy is an extremely thin veneer on an otherwise very human society. (religion.blogs.cnn.com)
There is a very thin veneer of climate science unanimity and collegial spirit in the public sphere. (realclimate.org)