I replaced the water pump on my wifes 300D a few months ago. Its now covered in rust. I am about to replace my water pump on my 300CD. Should I paint it first? If so what paint would you recommend?

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.

I would think some nice cheap spray Rustoleum, in an industrial silver, would work nicely - obviously don't paint the inside. The other alternative would be to move further away from the coast - say to Arizona.

I've used Rustoleum on the calipers of my 71 Cutlass. It still holds up well after 20 years. I think painting is a good idea if you have the ambition.

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95 E320 Cabriolet, 169K

I've used Rustoleum for my van's water pump and brake calipers. I used gloss black and it has held up for the last 6 years.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles

I don't think you should paint the water pump, Sonax used to sell a engine plaster product - a spray that is applied to aluminum and alloy unpainted engines to prevent rust, check www.carcareonline.com to see if it or a similar product is available

is it brand new waterpump???? If brand new waterpump, it supposes no rust!!! If getting rust easily, most of them are rebuilt. Buy the brand new one and it will last longer than the built.