Main reason:

1.The surface is not clean.

2.The environment has the pollution, such as the dust.

3.Other pollution such as dust from the body and covering the newspaper.

Precaution:

1.Ensure the surface must be clean.

2.Ensure the environment and air is clean. 

3.Remove any possible contamination pollution.

4.Sealing the surface.

Correction method:

1.If it has slight dust, use the P1200 sandpaper to polish and then use polish wax.

2.If it has heavely dust and particles, using the P800 sandpaper to polish and spray again.