I'm not really that worried, although I will be solvent and detergent washing before VHT paint.
Some very well known tuners use TSR. The recommendation to rewash is Dave covering himself.
Whilst I've obviously only spot checked the cases, I've failed to find any traces of anything untoward.
To give you an idea of the crystaline surface in the earlier photo, these are mm graduations on a steel ruler.
I'd expect blast media to be 0.5-0.6mm