Had my 'A' series thermostat housing vapour blasted last week, comes up a treat and due to the process retains it's finish:
Pretty manky looking but was soon transformed to this:
He did my Z3 diff cover 3 years ago and still looks good:
Due to the non aggresive process it is ideally suited to motorbike carburettors of which he does a lot including re-building them as other businesses don't like getting involved with them. He is ex army and it shows in his workshop, everything spick 'n span, nothing out of place, and would pass inspection anytime, nice guy to chat to also. Based in Derbyshire.