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Filler should be used in very thin layers, for smoothing only--not for actually filling dents. If a thick layer is required, the metal should be shaped more thoroughly. Filler will shrink and crack, similar to dried mud, if it is applied too thickly. Plastic-resin fillers like this generally have about a five- year life span on the car. Metal-resin fillers are more expensive, but are said to be essentially permanent. Follow the instructions carefully when mixing filler, then spread it on smoothly over the entire area of the repair.
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