Pitting after firescoff

[GCS-Creations]

Hello everyone,

I've just taken up some occasional jewellery work again after visiting a course a couple of years ago and thought I'd go with firescoff when I was getting my supplies together as it seemed worth a try for my occasional use.

I realise that the product gets mixed reviews by many people, but I've ran into an issue that no one seems to have mentioned yet:

Whilst part of the coating it creates can be washed off with warm water as advertised about 40% of it can barely be removed, and when it is removed the silver (sterling) is deeply pitted - deep enough that it can't be buffed out but needs to be sanded. (and the soldered piece removed to be able to sand it and the piece engraved again)

Has anyone ever had the same problems?
Any tips I can try?

I've attached an image that hopefully is somewhat helpful in illustrating my problem. I sadly forgot to take one of the coating removed and the pitting showing. It's basically there where there are 'bubbles'/grooves.



Cheers,
Geoffrey