thank you for the reply.
As our ship is made of aluminium, it is very important that there are no iron particles from former blasts in the sand-material.
How this can be guaranteed? Would you use new blast material - what will be the costs therefore?
Maybe it is better to grind the surface down to the bare aluminium in conventional way instead of sand-blasting?
What do you think?
Sorry for the many questions, but our yacht is all we have, so we have to be very careful …