Royal Enfield — Its been just 2 months I replace my petrol tank and mudguard costing around 18000 Rs of my classic 350. Showing color issues

Address:

Illahibagh , soura , near crpf camp lane no. 1 arifeen colony , house no. 4

Its been just 2 months I replace my petrol tank and mudguard costing around 18000 Rs of my classic 350. Only after 2 months of it, it started loosing its colour with some white dots