Since I have springs on the brain (front springs on 98 getting replaced), I looked at the springs on the 99 and noticed a two inch section on one of the rear springs that is exposed (i.e. black coating came off) and has surface rust. Am I correct to assume that it's worth my while to put some POR-15 on there to delay the inevitable?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Generally high carbon steel like in springs rusts slowly. I might just dab some heavy grease on the area. Then check it once a year to see that it is still there.

rattle can rustoleum - touch up as needed

x2 on the rattle can rustoleum.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)