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Really stupid painting question

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Bob - KS

10-15-2001 08:41:13

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I had a paint gun given to me that is one of those 2 quart jobs with the 'external' spray head that has two hoses (air and paint) between the pot and the sprayer. I've played with it using latex paints only because while I can run a lot of water through it to clean it out - I have no idea how much it would take to clean it using an 'oil based' paint. However - since I want to learn how to re-paint some equipment - sooner or later I'm going to have to ask - how do you clean one of these guns after using 'real' paint in it? Do you just run a lot of paint thinner through them, or is this not a good gun to use in that kind of application. As you can tell, I'm so clueless on this painting thing I don't even know where to start, but I am stubborn enough to learn sooner or later.

thx in advance,
Bob

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Franz

10-15-2001 22:23:29

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Re: really stupid painting question in reply to Bob - KS, 10-15-2001 08:41:13

What you have is called a pot gun. It is about as close to a gravity feed gun as you can get, but, those guns weren't designed for the micro-atomization necessary with today's paints. You can still do a decent job with a pot gun, shooting enamel though.
They were quite commonly used in production painting, especially in volume spray booth situations like Maaco.
Cleaning the paint hose is a fairly simple situation, if you always use the same type of paint. You can reuse the same thinner for gun cleaning over and over, since you rarely use 1/2 ounce to clean the gun head itself. After cleaning the head, discharge the pressure from the pot, and hold a rag over the fluid tip portion of the nozzle, and pull the trigger. This will send the fluid in the paint line back to the pot. Then you repressurize the pot and shoot more fluid thru the gun. A couple repeats, and all you have to do is wipe down the exposed parts.
Another technique that's particularly helpful is to have a liner in the pot. Usually, you can find a can or paint bucket that will fit inside the pot. This eliminates the need to wash down the inside of the pot, and also eliminates waste paint that wouldn't normally be picked up off the bottom of the pot.
Finally, since the paint line pressure is rarely above 5#, you can usually use vinyl tubing for a paint line. It's a good idea to determine first that the solvent of your paint won't soften or disolve the vinyl first though.

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Steven

10-15-2001 19:07:22

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Re: really stupid painting question in reply to Bob - KS, 10-15-2001 08:41:13

I have an HVLP (High Volume Low Pressure) gravity feed gun and I always use thinner to clean it out. Works great for me. A word of caution though - ALWAYS use the thinner designed for your paint. We used to clean out the guns with gasoline then we switched to PPG paints and tried gasoline and it made the paint get solid, instantly.

Nothing beats a quality paint gun for a good paint job, but I used to paint vehicles with one of those 1-pint touch up guns and did a good job with that too. I included a pic of what I painted with the touch up gun. Don't let anyone tell you it can't be done!

Hope this helps you out
Steven

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