Since, simplistically, the weight of paint should be proportional to the aircraft external surface, and the actual aircraft weight itself proportional to the aircraft's volume, one might expect that with the paint being proportional to the square of a characteristic length, and the aircraft weight proportional to the cube of that length, then the proportion of an aircraft's weight represented by paint and finishes should actually decrease with aircraft size, and it's the little guys who should care most about paint mass and thicknesses....