Rental or purchase sand blasters

I would think the blasting material alone would be pretty damn costly since once it is out of the tip of the blasting gun, it's lost to the elements and not like a blasting cabinet where it could be used again and again once filtered.

Drill pipe is pretty heavy duty stuff so why down to the bare metal to prime and paint????

There's metal paint out there that is a primer, finish coat and rust inhibitor added to pretty things up-------unless you're just a bit OCD and need a pristine surface to prime and paint.

Yes

as posted above you’d do better with a couple of guys with wire wheels. Shouldn’t take long at all. If it’s 25 year old paint you should be ok (no lead) but wear masks

much easier than dragging out a blaster and bags of sand and you won’t be making such a mess. Consider that you won’t know how much sand you’ll need till you get started

How does that work ?

How does the abrasive get in the water stream? The pump can handle grit?

Don’t use sand, use blast media. Sand can kill ya with the silica.

I wiped my pipe fence with Ospho before painting. Ospho converts the rust from iron oxide to iron phosphate which acts as a primer coat for rusted metal. You don't need to blast off all of the paint. You simply need to convert any rust exposed, and knock off all the loose paint. Home Depot has a similar product to the ospho brand. This is what I used. Same thing different name. I prepped and painted a little more than 2,000 linear feet of pipe around my property a couple of years ago.

Step 1, pressure wash all of the fence. Get as close as you can to the metal to knock off all the loose rust and paint as you can.
Step 2, I used a pump sprayer to spray the metal down with Ospho the night before I painted. You don't need to do anything else after spraying it. Just spray and wait a day.
Step 3, The day after you apply ospho, knock any loose oshpo off with a wire brush or just by brushing it with sand paper.
Step 4, Get after the painting. I used PPG epoxy primer and paint. I used a roller to apply. It's been 2 years now and the only places I notice any wear at all is where I have brushed the pipe with a lawn mower. It's expensive and requires an understanding on how to mix and thin, but it grips and ages way better than any other paint.

That is a lot of hose. I think my furthest post from a water spigot was about 500' but fortunately I have a ton of water hoses that I chained together. You might be able to ask a few neighbors to borrow their hoses for a weekend.

One of my former neighbors is a PPG sales rep. He gave me a really good deal on the epoxy paint. I think I still paid $1,600 for a couple of 5 gallon kits (20 gallons of material). He knows his stuff when it comes to paint and he said it's more work and prep up front, but you shouldn't have to worry about it for at least 10-15 years. He added additional dye coloring to the paint to give it extra life. You can request that PPG add more dyes and if you ultimately decide to go with PPG, chime in here and I'll let you know exactly how much of each part he added.

In all reality, the brand of paint probably doesn't move the needle much. I'm sure Behr and Sherwin Williams products are pretty comparable. I've also seen some other brands I've never heard of. Might do some googleing if you go a lesser known brand.

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as posted above you’d do better with a couple of guys with wire wheels. Shouldn’t take long at all. If it’s 25 year old paint you should be ok (no lead) but wear masks

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400' with wire wheels? Are you serious. Sandblasting is way faster. I have a new clemco bucket blaster i will sell you brand new. Comes with a cart that way you can move it around. Blast media isn't that expensive

1200’ of pipe? 400’ x 3 rails.