Rafael Rivera has developed ColorHex, an exclusive sketchup extension available in extension warehouse.
This sketchup extension is well matched with SketchUp 2017, SketchUp 2018 as well as windows platform.
The plugin can be used to paint any sketchup models based on #Hex color values by applying a series of toolset.
Brief description of tools:
Hex Brush Tool: The Hex Brush Tool paint faces through #hex color values. The users will be able to click & drag the mouse to incessantly arrange paint to the SketchUp model.
Hex Sample Tool: The Hex Sample Tool will opt for the color value of face entity to paint with.
Hex Input Tool: The Hex Input Tool facilitates the users to put in a #hex color value to paint.
Hex Magic Wand Tool: The Magic Wand Tool picks connected faces with the equivalent color.
The plugin can be downloaded from extension warehouse extensions.sketchup.com