There couldn't be a worse place for chrome than sidesteps; front wheels will throw lots of crap including sharp rocks that way. As already stated above, once chrome starts flaking, the best think to do is buff down to the whole thing and paint it. Getting paint to stick to chrome is tricky; use fine grit sandpaper and scuff-up the whole thing then repeat for the other side. A lot of work.
Rick 2016 Colorado Z71 Crew Cab, long bed
BDS 5.5" lift, Fuel Vector 20x9 rims, Toyo Open Country AT II Extreme 305/55R20 tires
Bushwacker pocket fender flares