Nissan has developed a clear paint called Scratch Guard Coat that heals itself within a week of minor scratches and scrapes, the Associated Press reports. The clear paint, developed in conjunction with Nippon Paint Co., contains elastic resin, similar to a rubbery surface, and can repair itself of slight scratches caused by car washing, off-road driving and fingernails. The coat lasts about three years, Nissan said. The scratch-proof paint job will be offered only in some Japan models of the X-Trail sport-utility vehicle, planned for sale soon. Overseas plans are still undecided, the spokesman said. Cost is $100 extra.