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Antique Tractor Paint and Bodywork

CNKS dust problem

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brad_bb

12-19-2006 15:02:19




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I was reading a post below and there was too much tangent conversation to try and filter out if you have improved your booth/dust problem. Do you have a cross draft booth? I basically have a binks "really clean" booth, which is to say cross draft with clean air intake filters in opposite end of drive in doors. Do you wet your booth down before you paint? I use floor sweep compound on the floor to sweep out the booth and then wet down the floor and maybe the first 3 ft of the walls to keep dust stuck down to the floor or suspended in the water. It will dry as you paint but will really serve to keep dust down. I also use pre-filter media rolls clothes pinned over the outside of my intake filters. I also make sure to spray upstream first and move down stream. I also wear a painters suit and my fresh air hood. If you do all these things, especially wetting down the booth, you"re going to cut the dirt down. Now if you tell me you already do all that...

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glennster

12-20-2006 08:19:50




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 Re: CNKS dust problem in reply to brad_bb, 12-19-2006 15:02:19  
sounds like you got a real good booth set up. being that the contaminant is like a lint is really puzzling. i'm suprised its even coming thru the filters. could it be some type of insulation, maybe a blown in type that the air make up unit is sucking in? maybe something n the fans that is degrading like felt seals ect? maybe a drive belt is coming apart? that one is gonna be a nightmare to track down.

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CNKS

12-20-2006 08:46:38




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 Re: CNKS dust problem in reply to glennster, 12-20-2006 08:19:50  
I literally don't know, for the most part I am able to eliminate what others have suggested. The fans are direct drive, no belts. The work area is 30x30, insulated with bat insulation covered with OSB, 6 inch walls. The booth is about 10x12 inside the work area. Air is let in through a partially open window, but it has to travel about 15 feet in my "dirty" building before it gets to the booth filters. I have considered running ducting from the window to the filters, that doesn't seem very pratical to me. Areas around the sliding door that I move equipment in and out is not sealed, so of course, with negative pressure, air comes in anywhere there is a leak. BUT, I have tried painting outside on a relatively calm day (about 1 day/month is calm in KS)-- problem looks the same to me. So, I'll either figure it out someday, or become skilled at buffing. Thus my earlier question about higher quality AU, possibly base-clear, since I have been unable to get single stage PPG Omni single stage to buff out to my satisfaction.

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glennster

12-20-2006 14:22:36




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 Re: CNKS dust problem in reply to CNKS, 12-20-2006 08:46:38  
i put a call to our paint tech line today re the dust. they advised to check the air inlet passages of the gun before it gets to the paint, from where the air line hooks up and into the gun. they said they have seen a build up in these passages that dislodge and then show up in the paint. when the gun is cleaned, it usually doesnt gets these passages cleaned,the stuff builds up and gets loose. apparenty these micro dust particles are small enough to get thru the filters and lodge up in the gun body. worth a peek!

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CNKS

12-20-2006 17:09:33




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 Re: CNKS dust problem in reply to glennster, 12-20-2006 14:22:36  
Nope, does that with new guns, old guns. Have a gun used maybe 4 times, did it the first time it was used. New air hose, running thru 2 water traps and a filter on the gun -- positive it is not a gun problem.



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CNKS

12-19-2006 17:34:45




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 Re: CNKS dust problem in reply to brad_bb, 12-19-2006 15:02:19  
I don't have a professional booth, I do wet the floor, it makes no real difference. I do spray from the intake toward the fans. Watching the overspray, there is some swirling, since I don't have a wind tunnel I can't do much about that. My fans are varible speed, the speed doesn't seem to matter. I have done it with the fans off, no difference. I have not used floor sweep, it might help, but I don't think the dust, identified as lint, is coming off the floor or walls. I have wondered about prefilters, exactly what is the brand/type you are referring to? I have layered the filters, though. I was using premium furnace filters, the highest rated I could find. I switched to paint booth filters, they are better, also cheaper than furnace filters, but they did not completely solve the problem. I wear a supplied air tyvec hood, and usually a tyvec shirt or jacket -- again, although I think such things are a good idea, I really do not think that is the problem. I have simply tried too many things without much success. As I said in the post below, the items I hang from the ceiling are better than the ones on the tables I use, but I can't hang everything. The tables are grounded through the concrete floor with rebar to the soil below. The table surface is galvanized metal, covered with paper with 1/4"? woven wire clamped to the table and rebar. It is a good ground and seems to help. I sometimes dampen the paper to try and eliminate any dust the gun might stir up. All this currently has me leaning toward static electricity -- I have yet to do anything about that. May or may not do that on this tractor, as it is mostly done, except for some more sanding and buffing.

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Rustyj14

12-31-2006 09:14:12




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 Re: CNKS dust problem in reply to CNKS, 12-19-2006 17:34:45  
CNKS, i have been reading about your problems with dust! You have just about done everything possible to keep it out of the paint! Last place i worked, the paint "booth" was a large shop stall, with a large, very old and dirty canvas, roll up door! the walls and crevices had never been cleaned, no maintenance, except for me pressure washing down the walls and floor occasionally! No lowered ceiling! No filters in the door, no windows! But---The exhaust fan turned slowly, up high in the side wall! And, my dust problem was very minimal! I refinished new and used cars in that atmosphere, with great results, and hardly any dirt or dust! Another place was about the same--had lots of dust catchers setting on old wooden shelves on the walls. Large dirty shop windows on 2 sides! The "exhaust fan" was made in 1930, had paint caked on it so heavy that it was lop-sided, and didn't turn very fast! The boss wouldn't let us take time to clean the place, so i painted many Jeep products in there! I never had a dust problem there, either. Now, maybe your fan is turning too fast?? Try turning the speed down. It will take longer to clear out the overspray, but it might help solve the dust problem. When i paint in my home garage, i usually leave the overhead door up slightly, and turn on the large 3-bladed commercial exhaust fan, and do the painting, with minimal dust. Rusty J.

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