Saka nga po pala, balak ko sana magbuff ng sasakyan ko gamit grinder with buffing pads.
Don't use a grinder, its to powerfull. Baka masunog pintura mo. Either buy a Rotary or have a professional do it. Mukhang DIY ka, so better invest in a Rotary :D.

Ung left quarter panel ko kasi nanotice ko na after marepaint (scratch on gate), iba ung kulay compared sa whole body.
Mismatched color matching, either because A. orig color already faded or B. mali ang timpla