Just in the last few days I tried the E-tech caliper paint (eg
https://www.amazon.co.uk/SILVER-Caliper ... iper+paint).
I didn't have time to do an in-depth refurbishment - that is get them dipped/stripped and plated - so I brushed off the corrosion and stripped the old paint (it dissolved with carb cleaner) and just wanted a coating that would prevent further corrosion.
It has the consistency of smooth Hammerite so it's quite sticky to apply, and when applying it it seems to be difficult to get a uniform finish because the final appearance seems to be sensitive to the direction of the brush strokes. Coverage was ok - I did one coat everywhere, and then a second coat on the exposed parts. In the end, the final appearance was better than expected but still not the flat finish you'd expect from conventional paint. I can post a photo if you're interested.
Adhesion didn't seem to be a problem, but the plating on mine was long-since tarnished, or gone completely, so that will probably have provided more of a key than a fresh plated finish.
It took a long time to dry. Like Hammerite, it was mostly dry (just slightly tacky) after about 45 minutes, but then it remained slightly sticky for a few days despite being in the airing cupboard.
It's not the same stuff as Hammerite, because I tried cleaning the brush with Hammerite thinners, and it all congealed. Cellulose thinners (as they suggest) worked fine.
I don't know how durable it is yet, obviously.
Overall conclusion: simple and effective but, in terms of the final appearance, but I think you'd get a better result with a more conventional enamel, especially if you're starting off from a pristine state.
Edit: I've still got 90% of the tin if you want yours silver
Paddy