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> WET SANDBLASTING A 914
mepstein
post Aug 12 2016, 10:09 AM
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Remember, like scotty b has said in past threads, your compressor won't work, you need to rent a big commercial unit.
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ssuperflyoldguy
post Aug 12 2016, 10:45 AM
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QUOTE(mepstein @ Aug 12 2016, 09:09 AM) *

Remember, like scotty b has said in past threads, your compressor won't work, you need to rent a big commercial unit.


Or gang several compressors on a single line...
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scotty b
post Aug 12 2016, 01:51 PM
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rust free you say ?
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QUOTE(mepstein @ Aug 12 2016, 08:09 AM) *

Remember, like scotty b has said in past threads, your compressor won't work, you need to rent a big commercial unit.

(IMG:style_emoticons/default/agree.gif) yeah, that problem too. Despite the nice lady at Dustless blasting being told EXACTLY my compressors stats, she told me it was more than enough to run the system.
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Mark Henry
post Aug 25 2016, 08:19 PM
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Well I was intrigued so I went and bought an el cheapo, so far I just shot a rusty rim face and I'm impressed. I have a 4hp 3000psi power washer, the WSB unit was something like $70.USD ($119CA at princess auto in Canada)

I haven't done enough to review it and I have no holdtight so we'll see how much it flash rusts over night.
So far I'd say it has it's place, but care will have to be taken to to avoid the pitfalls. It makes a mess, you still get hosed with sand, but don't have to worry about breathing it in. Looks like it will go through a shitload of sand, I'd say I went through 50lbs just to do a rim face, but it only took me 10 minutes.
(IMG:http://www.914world.com/bbs2/uploads_offsite/images11.palcdn.com-26-1472177946.1.jpg)
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Mark Henry
post Aug 26 2016, 08:13 AM
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So this was the result of my quick test shot. As I said I don't have any Holdtight 102 (I need to find a canadian distributor) it's fairly high humidity out and I didn't dry it proper. Not to mention it was after dark and I wasn't dressed proper.
So it's starting to flash, but even with the flash it took off the heavy rust PDQ. If I just went from here and hit it with the dry blaster it would clean up damn fast.
The last pic of the back of the rim shows how heavy the rust was on most of the face.

As said you would have to be super careful if doing the body, but it will definitely be a useful tool.


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mepstein
post Aug 26 2016, 08:42 AM
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QUOTE(Mark Henry @ Aug 26 2016, 10:13 AM) *

So this was the result of my quick test shot. As I said I don't have any Holdtight 102 (I need to find a canadian distributor) it's fairly high humidity out and I didn't dry it proper. Not to mention it was after dark and I wasn't dressed proper.
So it's starting to flash, but even with the flash it took off the heavy rust PDQ. If I just went from here and hit it with the dry blaster it would clean up damn fast.
The last pic of the back of the rim shows how heavy the rust was on most of the face.

As said you would have to be super careful if doing the body, but it will definitely be a useful tool.

Why not just use a regular sand blaster on a steel wheel?
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Cairo94507
post Aug 26 2016, 08:48 AM
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Mark just probably wanted to blast some rust and the rim was easiest thing to find and do to test his new toy.
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gandalf_025
post Aug 26 2016, 09:21 AM
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Body shop I sent my car to had it Soda Blasted and
I didn't get to go see the car for over a week.
Took this picture while it was sitting there.

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Mark Henry
post Aug 26 2016, 11:13 AM
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QUOTE(mepstein @ Aug 26 2016, 10:42 AM) *


Why not just use a regular sand blaster on a steel wheel?


QUOTE(Cairo94507 @ Aug 26 2016, 10:48 AM) *

Mark just probably wanted to blast some rust and the rim was easiest thing to find and do to test his new toy.


Bit of both, yes it was handy, but I'm going to use this sprint star rim as a spare on my bug.

As far as a regular sand blaster or my blast cabinet using my 5hp (real 5hp) 120gal compressor I'd say this would have taken me about an hour+ to get this far.
For big jobs I've used a service in the past, but they have a minimum charge , make an appointment, get my ducks in a row, wait till they get here or take it to them...paint like crazy for the next 24 hours.
This was one hell of a lot faster.

Mark do you use air ratchets at work? Do you torque with them as well?
Some tools are great at what they do, but you have to reach for another tool to finish the job.
To me this did a great, fast job on the heavy rust, a bit of flash will come off PDQ in my blast cabinet. Better drying and holdtight and I should have minimal flash.
On flash and small parts I wonder if drying in my shop oven would help.

Not for everyone, it makes a hell of a mess.
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Curbandgutter
post Aug 29 2016, 02:00 PM
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Well I got busy wet blasting the 914. Ran out of sand (2000lbs). 90% complete. The blaster worked flawlessly not a single clog after blasting through 2000lbs of sand. Did not use hold tight. Spoke with my paint manufacturer and they said flash rust is not a problem for epoxy primer. Just hit it with scotch brite and a cleaner that they provide. Steered away from rust convertors or soda or anything that I would have to neutralize either acid or base.

https://www.youtube.com/watch?v=RZ0oQxO59Y8
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VaccaRabite
post Aug 30 2016, 08:07 AM
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QUOTE(Curbandgutter @ Aug 29 2016, 04:00 PM) *

Well I got busy wet blasting the 914. Ran out of sand (2000lbs). 90% complete. The blaster worked flawlessly not a single clog after blasting through 2000lbs of sand. Did not use hold tight. Spoke with my paint manufacturer and they said flash rust is not a problem for epoxy primer. Just hit it with scotch brite and a cleaner that they provide. Steered away from rust convertors or soda or anything that I would have to neutralize either acid or base.

https://www.youtube.com/watch?v=RZ0oQxO59Y8

IIRC you can reuse the blast media with wet blasting a few times (2 or 3).
If you supplier says otherwise, obviously go with that.

Zach
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Curbandgutter
post Aug 30 2016, 08:53 AM
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QUOTE(Vacca Rabite @ Aug 30 2016, 07:07 AM) *

QUOTE(Curbandgutter @ Aug 29 2016, 04:00 PM) *

Well I got busy wet blasting the 914. Ran out of sand (2000lbs). 90% complete. The blaster worked flawlessly not a single clog after blasting through 2000lbs of sand. Did not use hold tight. Spoke with my paint manufacturer and they said flash rust is not a problem for epoxy primer. Just hit it with scotch brite and a cleaner that they provide. Steered away from rust convertors or soda or anything that I would have to neutralize either acid or base.

https://www.youtube.com/watch?v=RZ0oQxO59Y8

IIRC you can reuse the blast media with wet blasting a few times (2 or 3).
If you supplier says otherwise, obviously go with that.

Zach


Yeah you can reuse the blast media....but then you would have to recover and dry before use. Then you would have to hope for some really hot days and spreading out the sand then collecting it again.........too much work when sand is so cheap and I really don't want to store 1000 lbs of sand. By the way, I am blasting where I'm going to cast a concrete pad......so the sand is going to some good use.
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bulitt
post Aug 30 2016, 11:20 AM
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Mark- I have used this Krud Kutter stuff after conventional sandblasting to prevent flash rust. Works well, comes in a concentrate also.

(IMG:http://www.914world.com/bbs2/uploads_offsite/d2pbmlo3fglvvr.cloudfront.net-13632-1472577640.1.JPG)

Most big home improvement centers carry it.

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bulitt
post Aug 30 2016, 11:28 AM
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Mark- I have used this Krud Kutter stuff after conventional sandblasting to prevent flash rust. Works well, comes in a concentrate also.

(IMG:http://www.914world.com/bbs2/uploads_offsite/d2pbmlo3fglvvr.cloudfront.net-13632-1472578089.1.JPG)

Most big home improvement centers carry it.

Allis Chalmers engine one week after blasting

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Primed and painted PPG

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Curbandgutter
post Aug 30 2016, 02:40 PM
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If you do a search on flash rust you're going to get answers both ways.....1) use a metal prep (rust converter,etcher) 2) don't use a metal prep, etcher.

According to the manufacturer of my epoxy primer (SPI) they said Do Not Use a Rust Converter, flash rust is fine!

I guess the best thing is to call your paint manufacturer and see what they say. As far as I understand PPG also does not want you to use a rust converter. I believe that their reasoning is that people will not do a good job of neutralizing with water before primering it. Or that some of the acid gets stuck in the seams and does not come out. Eventually it does come out and it will ruin your paint job.
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