Originally Posted by N8DAV8R
Color matters. A good yellow paint job weights up to 4X more than white. This is why I mention above that it's just a guess unless someone took the same plane and weighed it with matching prep and color.
At least vinyl comes in a pre-set thickness, with a known weight per square meter. So a vinyl estimate is pretty easy to get, as someone above has done.
The people who weighed their painting supplies ahead of time and again afterwards probably have the best estimates for added paint weight... If you consumed 10lb of paint while painting, that'll be an upper limit of how much went on the plane...