No, it is not safe to do this. To ensure the future safety of your child it is essential that you no longer use a car seat and base after an accident. In a collision, huge forces act on both the car and the car seat. This can cause hairline cracks that are invisible to the naked eye. Through daily use, exposure to the sun and large fluctuations in temperature, an initially harmless hairline crack has the potential to trigger complete material failure in the event of a second collision. In this instance, your child would no longer be protected. Therefore, you should not under any circumstances use the car seat any longer, and should purchase a new seat.