Secondhand GPU Block - Nickel Plating issue

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I'm happy with my CPU AIO cooler but I'm looking to do a simple GPU loop as a first foray into watercooling. I've found a cheap second hand Waterblock (pic below) which I'm thinking of buying but it has signs of Nickel plating wearing off (common for EKWB I think). is this too bad to be usable or should it be ok from a performance and leakage perspective?

 

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Thanks all, decided to the roll dice on it in the end. Now I just need to figure out what other gear to get!

 

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what GPU is it for

It’s for a 3070 FE, I’m not upgrading GPU anytime soon but I thought I’d get a simple watercooling loop setup with a view to reusing the parts (except for the waterblock). My main priority is something that is going to be quiet and future proof. The plan is to run two rads in the future but struggling to figure out the best fan / rad combo for right now.

 

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Alphacool ST30 360 V2 with Arctic P12 fans. Job done.

What's your case, radiator space and CPU?

I’ll be getting a new case as part of the move to watercooling. Looking at ones that support dual 360mm rads or higher but no closer to making any decisions on it.