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I like Durafill for leather refinishing and plastic repair edge/pit smoothing, as it’s thicker than LCF, and more sandable than XR-10. It dries almost clear, so airbrushing is minimized. I’ll still keep LCF (I’m a big fan), but Durafill may be replacing the XR-10 in my kit.
Specific recent use: Durafill feathered edges of catalyst where sticky dash prohibited sanding. (2008 Subaru Legacy)