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NEED ADVICE ON SAND BLAST MEDIA

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DL

07-10-2004 21:09:35




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I've recently been doing a bit of sand blasting... mostly structural steel and nothing I'm too concerned about as far as appearance goes, only blasting to remove rust before painting for corrosion control. I've been using black beauty (coal slag) and copper slag... both work exceptionally well, but are aggressive and leave the surface a bit rough. I'd like to blast my horse trailer (steel) and need some advice on which media to use to give the correct finish to get a reasonable paint job. I'm not looking for a "show quality" finish, but, I'd like it to look presentable when I'm done. My main concern is to get rid of a bit of surface rust and "cancer" then paint the trailer to prevent further corrosion. I'm using a 175 cfm compressor with a 650# blast pot, & 1/4" carbide nozzle. Any help appreciated!
Regards, DL

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ZANE(WA)

07-12-2004 20:05:12




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
I know it's cheap and there are plenty of media type that will work far better, but what the heck, it works.
On my way home from work I stop by an area near the river where wind-blown sand eddy's up and collects. I stop by whenever I get low and pick up a couple of 5 gal buckets of natural un-processed sand. I done one of the horse trailers, three tractors and some implements with the stuff. I can't say it's too aggressive, if anything, I suppose it could be called passive sandblasting, it takes awhile to get it going, unlike silica abrasives. Primer/filler flows and adheres well without having to put on too thick of a coat. A good thing I suppose is that sheetmetal doesn't get near as warm as when commercial abrasives are used. OH WELL, To Each His Own....

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Jim K

07-12-2004 07:36:35




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
I would see if you can get walnut shells. best way to remove just the paint wont leave that sandblasted look on even alluminum. (get the finest grade you can get).
Jim K



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Kens640

07-12-2004 06:59:42




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
Gee I had some of that fine coal sand & my outfit wouldn't shoot it . I use a 5 hp 80 gal compressor with a 100# presurized blaster . So I went to a sandblasting firm & bought some 2.5 silicone sand . It's aggresssive yet fine enough to leave a smooth look . Ken C



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Wayne

07-11-2004 20:37:56




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
I don't know how pricing is in your area, but I'd go with whatever I could get the cheapest and still do the job I wanted, especially if your doing it in the open and can't recycle the material. Depending on how many paint layers there are and how heavy the rust is you should be able to use either a meduim or fine grit material and get a passable finish with either. In the past I've always used a medium grit BX-12 sand to do a job like your describing. I've done alot of antique gas pumps for a guy that had heavy rust and multiple paint layers. In a case like this a meduim grit works great. Doing sheet metal though you need to stay back several feet with the nozzel and keep it moving to prevent the metal from warping due to heat from the blasting process. Since your doing a horse trailer with, I assume, large flat sides that's something you need to watch out for. Start in the middle and work your way to the edges so the heat will dissipate as you work instead of going in from the edges in which will cause the heat to build toward the center. If you wanted a little less "profiling" on the blasted piece you can go with a finer BX-30 and it will still do a good job. If you've got mainly surface rust and a single paint layer this will work just as good as the BX-12 but if the paint and rust are heavy figure on it taking about half again as much material to blast the same amount of area. Just my .02, hope it helps.

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Rod (NH)

07-11-2004 10:42:15




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
Hi DL,

I agree with George. Black Beauty is the way to go. I wouldn't be too concerned with the profile, especially if you are going to use a two-part epoxy primer...at least if you are using the standard grit. You might want to consider using the fine grit in Black Beauty if you can find it. I have used the extra fine variety for blasting aluminum prior to clear coating. It is more powder than grit :o). That worked great and did not leave any profile. It was basically a cleaning and oxidation removal operation so I don't know how the extra fine would work on paint and rust. The fine should do OK though w/o a lot of remaining profile.

third party image Rod

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Raymond Bagwell

07-11-2004 20:54:59




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 Re: Re: NEED ADVICE ON SAND BLAST MEDIA in reply to Rod (NH), 07-11-2004 10:42:15  
I have used the extra fine 3000 Black Beauty and it works fine. I would not use sand or any sand products for blasting.



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George

07-10-2004 21:57:15




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 Re: NEED ADVICE ON SAND BLAST MEDIA in reply to DL, 07-10-2004 21:09:35  
I'd stick with the Black Beauty slag product, especially since you want to remove rust. To keep the expense down, you may want to recycle the slag by collecting it and screening through fiberglass window screen to get rid of paint and rust flakes. (I use this product in my blast cabinet and am very happy with it.)



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