Fil-Stiks are semi-hard putty sticks used to fill in nicks and scratches or open corner joints. They can be protected with Tone Finish aerosols or other coatings. No heat or special tools are required for these. Simply, rub in and wipe off.
 
These are the 62 original colors included in the M230-6200, that was discontinued by the manufacturer but is available here exclusively! 
 
Handlebar Hank recommends these too.