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Old 07-10-2010, 11:34 AM
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Best abrasive for large-scale rust and paint removal jobs?

What would be the best ( as in cheapest ) sand type abrasive to use in my sandblaster for some large scale rust and paint removal jobs. Yes I know the aluminum oxide is some nifty stuff, and I love to use it but it would get rather costy for large scale job like stripping a truck bed and an old propane tank, so I'm thinking in the regular sand department here ( or whatever else might be nice and cheap :-), wondering what kind would work best.

Thanks------Robert

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Old 07-10-2010, 12:20 PM
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regular sand isn't a good idea on body panels. can be used if your a good blaster, but otherwise it can make the panels wavy..
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Old 07-10-2010, 12:39 PM
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We use silica sand around here, get it at the local lumber yard, 80 lb bags. Regular gravel pit sand varies in size too much, silica sand is screened to a even size. Same sand is used in pool filters.

Wear a dust mask, silica is hard on the lungs.
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Old 07-10-2010, 12:58 PM
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Quote:
Originally Posted by matt167
regular sand isn't a good idea on body panels. can be used if your a good blaster, but otherwise it can make the panels wavy..
I suppose I should clarify, the truck bed in question isn't a stock bed. It's a Western Hauler bed, and the lovely folks there in Texas who made the thing, while it's a real nice bed, it's made out of 3/16" plate all the way around, so there's little chance of it going wavy with the use of anything short of a torch, it's quite obvious that they didn't use any metal prep before painting because the blamed thing is rusting through the paint all over the place. I started out going after it with the sander and quickly gave up when I realized the whole thing had to come down.
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Old 07-10-2010, 01:03 PM
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Quote:
Originally Posted by ericnova72
We use silica sand around here, get it at the local lumber yard, 80 lb bags. Regular gravel pit sand varies in size too much, silica sand is screened to a even size. Same sand is used in pool filters.

Wear a dust mask, silica is hard on the lungs.
Sounds like a winner. I use an ammonia grade respirator when painting and when blasting with the aluminum oxide. I'm worn out enough already, I don't need to add to it
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Old 07-10-2010, 01:39 PM
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I hear Alabama is selling sand cheap. Oil soaked so the bare metal won't rust until you clean and primer it. It's a BP product!
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Old 07-10-2010, 01:56 PM
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Quote:
Originally Posted by sqzbox
I hear Alabama is selling sand cheap. Oil soaked so the bare metal won't rust until you clean and primer it. It's a BP product!
Now that is just wrong

Vince
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Old 07-10-2010, 02:32 PM
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Yep, #4 Silica sand is what I have used on my frame.

Manus Abrasives has some good information on blasting media and methods on their website.
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Old 07-10-2010, 03:04 PM
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302 z28, Not really, an irresponsible big oil company causing an environmental disaster on another country's coastline is wrong. It's not open for debate on this site. Let's drop the subject. Sorry I brought it up. My bad!
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Old 07-10-2010, 04:42 PM
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#60 seems to work best in the lowwer pressure type
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Old 07-10-2010, 09:52 PM
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what type of blaster you have depends on the size medi you use.....dupont starblast gets my vote for your project.....or fine silica 30/60 grade if you are on a budget.be sure to wear breathing protection with silica.....either mill scale is popping on the steel ,or when they blasted it the paint thickness was not great enough to cover the blast profile....thats why for the do it yourselfer i would recommend the finer grade of media .....using starblast alot of people waste alot of it.....when using starblast the media valve should not be open as much like when using silica......it cuts better using less.....you definitely don't have to worry about warpage as i have blasted many flat beds and such with my big industrial rig with a 375 cfm compreesor.....hope that helps.....good luck
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Old 07-11-2010, 08:27 AM
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anything that leaves an anchor pattern will warp sheet metal .
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Old 07-11-2010, 10:35 AM
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shine not to hi jack this post but could you give me some info on another post i made ......sandblasting prices....i would appreciate your input.......and i agree on warpage if you do not know what you are doing and sit and burn on a specific spot and media ,air pressure ,nozzle size cfm and all.....but for a harbor freight blaster,,,,i wouldn't think you would see much warpage on 3/16 thick steel...just my .02
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Old 07-11-2010, 11:01 AM
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i charge 100 an hour to clean metal. from pressure wash to final wash . i also epoxy most everything i do. best time to do it is right after it is washed and dried.most leave in epoxy and lizardskin .

i showed a paint rep once how easy it was to warp metal.
cheap suction feed blaster with clean play sand , 30 lbs of pressure , one pass down the middle of a sheet of 14 gauge steel.... curled it immediately . any anchor patter left by blasting is peening the metal, stretching it , metal has to go somewhere.

staying off the surface and at 45 degrees is the only way i know to avoid warp. i run a 1 1/4 hose - 3/8 nozzle at 30 lbs of pressure.
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Old 07-11-2010, 12:24 PM
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plus use a respirator device when blasting , not a simple dust mask
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