Rust inhibitor - small quantity

I'm trying to restore a tiny dish drainer because I can't get another. Been looking for ages.

I've sanded and used Autosol on it but before I use chrome enamel paint on it I'd like to give it my best shot and use some rust inhibitor.

Decades ago you could get small bottles (the size of a general purpose oil) that I used to use on the chrome on my bike wheels.
Tried searching but everything seems to be a pint or more.

I'd welcome any sugestions or advice.

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