You're making great progress, with each piece being cleaned and painted separately, it should last a long time. I commend you for taking care of your grandfather's truck.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy