Edit: Exactly, get a tank blaster. You will sufer with a big job using a siphon blaster. Useless.
Well, any decent sand blaster will do. Be prepared for alot of sand everywhere. You can get sand in bulk. I get Q Rock fine grade sand from Steffey & Findley. They sell bulk sand, brick, etc. You may have a simular place nearby. IF YOU DO THIS, read the bag. Do not blast or handle/manipulate sand without some form of QUALITY filter on your face-one that covers the mouth and nose-and not a cheap surgical mask air filter. You can use the safe media, but the cost will soon become unbearable. I get 50 lb bags of Q rock for about $9 a bag. You will also need a sand blasting hood.
I quickly dulled up the glass in the hood, so I took the glass out and took that to a glass shop and have 10-15 made at a time. I probably go through 6-7 doing a whole car on the rotissori.
You can keep the bags, sweep up the bulk of the sand and use a flat shovel to fill the bags half way (so they are not so heavy). Get one of those cheap expandable window screens from Lowes and push it together so you have two screens and you can sift the used sand. I put one of those big red funnels in the sand blaster tank and put the screen over the funnel and scoop the sand with a paint measuring cup. You will have to shake the screen. OH, you will need to sift the new sand the same way. You WILL find small rocks that will catch in the valve, then when you crack the valve a little more, it will let the small rock particle through the valve and lodge in the nozzel and really piss you off.
ALso, once get one of these sand blasters, you will think you should just open the sand valve all the way. Crack that valve till you get a good stream of sand. Open it all the way and you will be refilling the tank very quickly. Ask me how I know...
Get a ton of extra nozzels. The sand will wear them away on big jobs and you lose the cutting force of the sand as the nozzel wears and the hole gets bigger. I go through 3-4 nozzels on a whole car.
So, get the sand blaster, resperater, hood, extra glass, extra nozzels, funnel, screen, shovel, sand, air. You're ready for more fun that you can shake a stick at!