March 19, 2013
As you probably know, the Painter tool can be used to apply keywords. If you enter a keyword in the Painter tool, Lightroom knows that the Painter tool is “loaded” with that keyword – even after you have put away the tool. So, if you have a “default” keyword that you often apply, enter it in the Painter tool and then use Shift + K to apply that keyword without having to select the painter tool, or use the Keywording panel.

January 31, 2013
I often see photographers using the Painter tool in Lightroom to apply star ratings. Don’t forget, there is a whole list of different items that can be applied – including Keywords, Label, Flag, Rating, Metadata, Settings (Presets), Rotation and Target Collection!

July 30, 2012
In this Quick Tip (The Painter Tool in Lightroom 4), Julieanne will show you a few of her favorite uses for the little-known Painter tool in Lightroom 4.
November 28, 2011
There are several shortcuts that can help when working with keywords in Lightroom:
• Command + K (Mac) | Control + K (Win) will highlight the Keyword text entry field.
• Command + Shift + K (Mac) | Control + Shift + K will highlight the larger, Applied Keyword box above it.
In addition, the Painter tool can be “loaded” with a keyword(s):
• Command + Option + Shift + K (Mac) | Control + Alt + Shift + K (Win) will display the Set Keyword Shortcuts dialog box where you can set the Painters tool’s keyword. Then, with the Painter tool, simply click on any image in the Grid view to apply that keyword. Click-drag across multiple images to apply the keyword to several images.
• If the painter tool is set to apply keywords, Shift + K will remove the Painter tool’s keyword from the image.
Finally, Option + 1-9 (Mac) | Alt + 1-9 (Win) applies keywords from a keyword set when using the number pad on an extended keyboard. Holding the Option + (Mac) | Alt (Win) key displays the numeric shortcuts next to the Keyword Set so that you can see which number will apply what keyword.
March 11, 2011
Option-Command (Mac) / Alt-Control (Win) + K invokes the Painter tool (used to “spray-on” information such as ratings and keywords). Option (Mac)/Alt (Win) -click to remove the information. Escape releases the tool.