Christina Eneroth has developed Eneroth Layer Painter, the most updated sketchup plugin available in extension warehouse.
This sketchup plugin is compatible with SketchUp 2016, SketchUp 2017, SketchUp 2018. It is a paid plugin and costs $10.00. By using this plugin, you can improve your drawing and productivity skills in sketchup.
With this plugin, it is possible to employ layers to entities quickly in a Paint Tool-like fashion. It facilitates faster application of layer to entities devoid of searching for the layers by name every time.
To run the plugin, go to Extensions > Eneroth Layer Painted or the toolbar.
You can create your own shortcut as Alt+L for this extensions (L is intended for Line Tool and Ctrl+L, Shift+L and Ctrl+Shift+L applied by Eneroth Swift Layer Manager).
Remember that the tool selects layer from the topmost group/component. To choose from child entities utilize the context menu (right click) devoid of pressing Alt.
Go through the following link to download the plugin extensions.sketchup.com
To learn how to apply the extension, watch the following video.