Recommendation for bolt/bracket re-plating?

[spiderlane]

Hi,

Can anyone recommend somewhere to re-plate/passivate a bunch of bolts and brackets/fittings? (Yellow zinc). Either local to me in Surrey/London (or Southampton where I work) or somewhere which will operate by post.

I used a local place last time and whilst they looked great when they came back...

There are a couple of problems with them. First off they blasted everything first making the threads "gritty" and the finish on the brackets "dull" rather than "shiny" and secondly after about 6 moths some of the plating is coming off in places so they can't done a very thorough job.

All recommendations welcome.
Cheers
Mark

[SM25T]

Electroplaters normally dip in acid to clean, rather than blast clean.

[spiderlane]

Yeah that's what I was expecting. I was surprised that they'd blasted them, hence looking for a new supplier for the next batch.