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Paint sprayer

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Rob N VA

10-30-2005 15:15:10




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Before I even go near my sheet metal with my new spray gun, I decided to practice. I have been needing to paint the shutters on my house, so I figured why not. This is an automotive HVLP "bottom cup" 80 dollar craftsman gun. I was using an oil based enamel which was very thick. Initally when I put the paint in the cup, nothing came out but air. So then I tried a little paint thinner and kept adding the thinner until it was the consistancy of water. Worked fine then. I was wondering if this is normal? is automotive paint thinner? Was adding paint thinner the right thing to do? Do I have to do that (add thinner) to the TSC paint I am going to use on my tractor? Thanks!!---Rob

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lonestarjeff

10-30-2005 21:35:00




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 Re: Paint sprayer in reply to Rob N VA, 10-30-2005 15:15:10  
Rob:

I think TSC paint suggests you use VM&P naptha as a thinner/reducer. The thinner you're using will likely make the paint dry-time longer. If temps are getting below 65 around there, it'll stretch out dry-time too.

Your HVLP gun will need the TSC paint thinned down. You've seen that siphon straw that goes to the bottom of the gun's cup, imagine trying to suck a thick milkshake thru it. Your gun can't get near that much suction.

Try 1 part naptha to 3 parts paint. If the gun shoots a course pattern of drops, try 1 to 2 ratio, etc. You'll know when you've got it just right, a fine mist that covers quick & slick.

Jeff

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old

10-30-2005 15:25:09




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 Re: Paint sprayer in reply to Rob N VA, 10-30-2005 15:15:10  
Depends on the paint as far as how much thinner. Some its 50/50 some its 25/75 and some its 8 parts paint to one part thinner. You also need to use a filter cone each time you put paint/thinner mix in the gun. If you don't you will find your in trouble. I used some Van Sickle paint this summer and I will never use it again because thats the one that is an 8 to 1 mix so your not really getting as much paint for you money as you do with a paint that is a 50/50 mix.

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John (TR)

10-30-2005 18:25:12




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 Re: Paint sprayer in reply to old, 10-30-2005 15:25:09  
Huh? I've sprayed a couple of gallons of Van Sickle and would not be able to pray it at 8:1. I use a Sharp bottom cup auto gun ($175.00 new, a long time ago)with 35lbs air, using naptha as a reducer and using hardener. Id say i'm close to 2:1 or 3:1 to get it to spray. Even then, the real measurement is film thickness on the surface. The first coat I spray is quite thick even with almost a faint trace orange peel, I let that tack up, then reduce the paint a little more with each successive coat. By the 3rd coat I have coverage where everything is the same color and all the inside corners etc have paint. I usually change directions of the gun with each coat as well. I have been running 4-5 wet coats of VS and am happy with the results. The finish on the second tractor I painted does not even need rubbed out, it's very smooth. Judging by the way it sands later I would say film thichness is about right, too heavy of paint can crack in service. Just my 2 cents

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old

10-30-2005 19:04:03




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 Re: Paint sprayer in reply to John (TR), 10-30-2005 18:25:12  
Well lets just say I got a gallion of it thes fall, sept to be exact. The can said and I quote mix paint 8-1. I mixed it more like 4 to 1 and had real trouble from it. I'll never ever but it again.



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John (TR)

10-31-2005 02:53:15




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 Re: Paint sprayer in reply to old, 10-30-2005 19:04:03  
I think you are right, the can says something like that 8:1 but I usually ignore the thinning directions and thin it down 'till it sprays with my gun. I know there are different tips for the guns as well which I have not read up on. When I bought my gun I was buying acryllic laquer and that was the tip the guy supplied. That might be why I have the thin the paints down. Guess I've just gotten used to it. You can buy a viscosity gauge and thin so it's the same each time, I just look at the paint in the cup and how it behaves.

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guest

10-31-2005 03:39:27




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 Re: Paint sprayer in reply to John (TR), 10-31-2005 02:53:15  
You cannot judge your spraying on
using thick house paint.
CLEAN your gun completely, Never use
house paint again, and run enamal
thinner thru it.
Practice with enamal on an old lawn mower, back blade. An thin ONLY to
the recommended ammount.
Good Luck
George



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