1. Fading or Discoloration : If your car’s paint is fading or discoloring, it may be time for a recoat.

2. Chipping or Cracking : If you notice chips or cracks in your car’s paint, it’s a clear indication that the paint is deteriorating

3. Oxidation or Rust : Oxidation or rust spots on your car’s paint are a sign of damage from environmental elements.

4. Lack of Shine or Luster :If your car’s paint is no longer shiny or has lost its luster, it may be time for a recoat.

5.  Even if your car’s paint looks fine, it may still need a recoat if it’s several years old. Click on link given below for more details