Auto body filler sets gradually, proceeding through various stages of firmness, to a final extremely hard state. It is also temperature dependent and sets much faster in warm weather than in cool. If you are really impatient, setting time can be decreased by careful use of a hair dryer or heat gun. But don't overdo it or you may burn the adhesive!!
Auto body filler is a time-saver too! It can be applied, sanded and painted within an hour... a great time saver (and also saves my customer's the expense of a second visit). It is also weatherproof, waterproof and insect-proof.
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