IN MY EXPERIENCE IT HELD UP FOR A YEAR AND THEN SLOWLY YELLOWED NOT BAD BUT NOTICABLE. MY YEAR FOR MY CAR IS ALSO ABOUT 1500 MILES SO THE HOTTER IT GETS THE FASTER IT WILL TURN. IF YOU ARE GOING TO GET IT DONE GET IT DONE IN A HIGH TEMP POWDER IT MIGHT NOT BE AS BAD.
I HAD MY POWDERCOATER COAT IN IN A SILVER IT WAS NOT A REAL HIGH TEMP POWEDER LIKE 800 OR SOMETHING, I JUST LIKED THE SILVER COLOR. THERE IS HIGH TEMP POWDER AVAILABLE I SUGGEST YOU GET THE HIGHEST POSSIBLE.