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Antique Tractor Paint and Bodywork

convential spray gun adjustment

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Author 
ty

08-29-2004 17:56:33




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I'm having trouble adjusting the spray gun I have. It is a Sharpe Finex Gravity Feed Conventional gun that is brand new. I sprayed some urethane clear the other night and I ended up getting the runs ( I'm novice at this). I diid well with the base color. Some say to have the fluid control knob all the way out, but that seems very heavy to me unless I move very fast. Also, I had the pattern adjusted at full fan and it seemed as if I had to keep the gun 10 inches away to get a good fan unless I turned the fluid control way up. Then at ten inches the transfer efficiency was very low. Please help..... Thanks

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Jerry B

08-30-2004 12:07:26




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 Re: convential spray gun adjustment in reply to ty, 08-29-2004 17:56:33  
The Sharpe Finex FX300 is an HVLP. The FX200 is conventional feed.

Best check to be certain which model you have.



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Big Jim

08-29-2004 20:43:43




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 Re: convential spray gun adjustment in reply to ty, 08-29-2004 17:56:33  
Just Googled on Sharp Finex Conventional Gun and the first site I checked says it is a HVLP gun so you may want to try adjusting it that way. You may be feeding it too high of air pressure creating overspray and a high volume of material. I thought from what I"d seen before, all the Finex guns were HVLP technology.



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Dozerboss

08-29-2004 22:28:34




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 Re: convential spray gun adjustment in reply to Big Jim, 08-29-2004 20:43:43  
Jim, I think there are both versions available or a typo. Look at this website click here

They describe it as Sharpe Finex Conventional Spray Gun. Then under the features it says HVLP gun with your choice of tip size. I assumed it was a typo since he said it was a conventional gravity feed.

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Big Jim

08-30-2004 21:13:27




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 Re: convential spray gun adjustment in reply to Dozerboss, 08-29-2004 22:28:34  
There is information on FineX on the Sharpe web site now. It says there is a conventional and a HVLP gun. It"s interesting that the conventional uses 1/2 cfm more air than the HVLP model.



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Rod (NH)

08-29-2004 19:27:07




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 Re: convential spray gun adjustment in reply to ty, 08-29-2004 17:56:33  
Hi Ty,

An 8"-10" gun distance is quite common for a conventional (non-hvlp) gun and a 6"-8" distance is common for an hvlp gun. I am more used to conventional than hvlp and when I use my hvlp gun I feel like I am too close and painting in slow motion so it's a relative experience. Normally you would have the fluid control knob almost all the way out and the pattern control wide open with the proper air pressure existing at the actual inlet to the gun. If that condition is too fast for your liking, you can try cutting the fluid flow by turning in the fluid knob. That will yield a smaller orifice for the same tip size and will cut the paint flow rate down (assuming the same inlet air pressure). You may or may not have to narrow the pattern at the same time to obtain a good full pattern with the lower paint flow. I don't know if that would also result in a lower travel speed. You'll just have to try it and see how it goes. Try it on a piece of vertical test panel and not on any final product. Devilbiss has a good gun adjustment manual that I think is pretty generic and could apply to most any other manufacturer. The same principles are involved.

Make sure you are using the correct tip size for the clear and the correct additive(s) for the temperature at the time of spraying and be sure the metal temperature is the same as the air temperature. Also make sure you follow any recommended flash time between coats that is specified on the tech data sheet for the clear.

Runs are not uncommon. It takes practice (and some luck) to avoid them and at the same time avoiding unacceptable orange peel.

third party image Rod

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Dozerboss

08-29-2004 20:31:08




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 Re: convential spray gun adjustment in reply to Rod (NH), 08-29-2004 19:27:07  
Ditto on Rod's advice on tip size. Check the recommended tip sizes for the brand of paint you are using as a possible cause.

I tried looking up this guns specs but it's not on Sharpe's website. I did see it for sale though and it was offered with a 1.4 tip or a 1.8 tip. Are those tips interchangeable and do you have both? If those are the only tips available than this guns 1.8 tip would be slightly larger than recommended for clear urethane by using PPG's Omni MC160 as a model. You should have a 1.5-1.7 tip for that clear and a 1.3 -1.6 tip for the MCV basecoat. If you have only the 1.4 tip, its rated for the basecoat but not the clear. If you have only the 1.8 it's a little larger than recommended for this urethane clear and larger than needed for the base coat.

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ty

08-29-2004 21:09:09




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 Re: convential spray gun adjustment in reply to Dozerboss, 08-29-2004 20:31:08  
Sharpe makes both conventional and hvlp in the finex gun. Mine has the 1.4mm tip. I looked at the spec sheet for the dupont urethane clear that I used and it said I could use 1.4-1.6 tip sizes.



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Dozerboss

08-29-2004 22:48:14




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 Re: convential spray gun adjustment in reply to ty, 08-29-2004 21:09:09  
The next thing to try then is mix some more, double checking to be sure you have the mix ratio right and air pressure at the gun is correct. Spray some test pieces and see the result. When I think of a heavy coat I think of paint that is not atomizing correctly and lays down too thickly instead of smooth. That's usually too small a tip size or a dirty gun that's clogged. If that still doesn't work, then I would say Dupont is wrong on the tip size or that's a tip size recommended for the HVLP gun. Too bad they don't offer a 1.6 tip to try. That's how I came to own 3 HVLP gravity feeds and 2 touch up guns. I have run into paints that just don't spray right with the recommended tip. I blame it on the mix man and go to a larger tip. Then I twist his elbow a little bit for a better price on the next purchase and he blames it on "humidity" and I end up getting a years supply of strainers and mixing cups for free. Good luck.

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