Yes, TSR does sound like a competent firm - I think we should understand that there
is potential for problems with embedded blast material with incompetent firms so we should only use firms with a pedigree like TSR.
The guy I spoke to today sounded like a decent engineer who knew what he was doing but anybody can buy a vapour blast kit, get themselves a website and start blasting with no experience and with no knowledge of finishing the component.
This is interesting stuff to me - and I've learned something from this thread. I am going to get a microscope and it will be interesting to compare pictures of my dry blasting with yours so we know what embedded media looks like.
.......this thread has got a long way to go