A little side project. (70 Dart)

Took on a little side job for a friend of a friend. Car doesn't need much metal work. Somebody has put quarter skins on it and it looks like i will have to address some of thier sins but, overall pretty clean car. Right now the plan for my part of this car is just body and paint. I will try to keep this updated so check back often.

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What did the factory use for the pink primered area where the roof meets the rear quarter, lead? At some point in time I need to address this on my 70 Dart and it seems like an area of flex.