Are the flares smoothed out into the body fender as well? If so this is going to be a major task, involving repainting at least all the fenders, if not the car.
If someone has only filled the rivet heads/holes on the flares then the task is a little easier, but still a lot of work. You may want to consider just buying a new set of flares, I think the GTS ones sell for about $300 a set.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.