1. Obvious pores, bubbles, heap flow and wrinkling are not allowed.
2. It is not allowed to have pitting, impurities, scratches, dirt and uneven coating on the surface.
3. Serious leakage, coating peeling, color mixing and adhesion are not allowed. Do not allow the coating to become brittle and yellow, lose gloss, etc. due to excessive baking.
4. No obvious color difference or uneven gloss is allowed.
