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11. After it dries, the filler can be filed with a Surform blade (a ridged, half-round shape is the best one to get). Unless a huge amount of shaving and shaping is needed (it shouldnt be), forget the old consistency of cheese advice about when to file it back, since thatll only lead to peeling off or overfiling the filler. Let the filler dry fairly hard, and then rough-shape it with the file until the surface reveals uniform file marks and is properly contoured.