So you need to mark your forklift forks, Cascade offers etching in a chevron pattern for those who may need to make a visable mark on their forks. By relieving a little material you should be able to get paint to stay on your forks, since the paint won't come in contact with the load. Say you handle a couple different length pallets and you want to give your operators a visual means of how far the tines have penetrated so the don't "snag" the load behind the load they are focused upon.
Modifications of the forks by anyone other than the manufacturer may have undesirable consequences. Let us know how we can enhance your operation.