Wet sandblasting our sailboat! How much would it cost? Does it work? Kärcher wet sandblasting kit. 

I have heard that before that flash rust is no issue for Jotamastic. Still can't shake the feeling that a thick powdery layer of flash rust decreases attachememt at least a little bit though. In the end we removed the flash rust before painting anyway.

I think its a great technique that works well for removing old paint!

Use rust milk like whurt rust milk

Yes you can catch a large fraction of the sand if you tent in securely. Without tent the sand will spray quite far, but with tent it will collect on the floor. We have done that to see how wepl it works and managed to sand an additional 3m2 with recycled sand that initially was enough for 1m2. Keep in mind though that the sand will loose its edges when recycling and might not be suitable for all applications anymore. It was enough to blast of old antifouling but I am not sure how well recycled sand would fare against proper rust. All the best!

Ven a tomar un café si quieres :-)

Sure, for us also availability was an issue. Not sure where I would get that on Gran Canaria. But if its available that might be an alternative.

Masons sand works well. It has sharp edges. @@hippo.albatross

Oh thats good to know, thanks!

Yeah that is probably right...