Ramona said..stray said..
Obviously you cant sandblast at a standard slipway or yacht club but most states have at least one yard that deals with commercial vessels and will sand blast.
There are many small sand blasters on the market which are ok to key small areas which have first been taken back with a grinder and with a bit of planning its not too messy.
I do a bit of sandblasting at home. It's also a bit of a health hazard when using real sand. More dangerous than using a Jason pistol which has caused health problems amongst ex navy members.
Come on mate, you are obviously intelligent enough to know that there's a selection of blasting meadiums available these days. I believe it maybe illegal to use sand, If you old navy boys didn't have access to respirators and other PPE then you've proably go a case against your old employer.
I spent a few decades making sawdust in one way or another that don't entitle me to bag out wooden boats, and I can promise you there's little joy in scribing in a new garboard plank on a trawler.
And while I'm having a bitch grinding glass defiantly isn't to be treated lightly.