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Greco magnum spray rig?

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Forum topic by alittleoff posted 08-15-2018 03:13 AM 455 views 0 times favorited 6 replies Add to Favorites Watch
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alittleoff

541 posts in 1454 days


08-15-2018 03:13 AM

I finally broke down and bought supposedly a good airless spray rig. I’ve always used the cheaper Wagner type guns that didn’t last over a year or so and was thrown away just to buy another one that dripped and splattered paint everywhere until it quit. Any way the question is, what do I use to clean it with after using oil base stain or paint. Mineral spirits or paint thinner. I bought a gallon of each not knowing which would do the best job. Thanks in advance.
Gerald


6 replies so far

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Kelly

2105 posts in 3121 days


#1 posted 10-16-2018 05:39 AM

You can use paint thinner, turpentine, Naphtha or mineral spirits. The key is just to get it clean, so use what is cheapest. On a fifty foot house, it may take a couple gallons.

Recirculate using the first gallon (use the same stuff over and over. Be sure to clean the primer side by running it. Have the primer hose run into the bucket you’re pumping from and shot the nozzle in it too, with the cap off. Run for at least three to five minutes.

Switch to clean thinner and run that into the first bucket.

Even if I shoot latex, I store the unit with thinner in the line and pump, since it won’t rust the unit, and doesn’t freeze. I add some denatured alcohol to the last gallon, since it mixes with water left in the system. I add a teaspoon of lacquer thinner, so it stores in the line and pump and softens whatever latex and oil is left in the line.

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SweetTea

370 posts in 837 days


#2 posted 10-17-2018 11:40 AM

I don’t think that I would recommend using paint thinner, not sure about mineral spirits. I would be worried that the paint thinner would eat through the rubber seals inside the unit. Back when I used an airless spray rig I just used water to clean it out. The only thing that I ever shot through the airless sprayer was latex primer, latex paint and water based poly.

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Kelly

2105 posts in 3121 days


#3 posted 10-17-2018 04:31 PM

My airless unit is years old and has seen, literally, gallons of paint thinner, turpentine, Penetrol and so on. Others treat their commercial sprayers similarly. They are designed to handle it, or they’d be worthless toys.


I don’t think that I would recommend using paint thinner, not sure about mineral spirits. I would be worried that the paint thinner would eat through the rubber seals inside the unit. Back when I used an airless spray rig I just used water to clean it out. The only thing that I ever shot through the airless sprayer was latex primer, latex paint and water based poly.

- SweetTea


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fly2low

40 posts in 274 days


#4 posted 10-17-2018 06:10 PM

Greco is a mainline industrial unit and back in the day when I dealt with them, > 40 years ago, only saw oil based paints and coatings.

-- Rich Gig Harbor, WA

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MSquared

50 posts in 92 days


#5 posted 10-30-2018 03:43 AM

Check out The Idaho Painter video series. They primarily do interior and exterior house painting, but have good overall maintenance videos on these machines.

-- Marty, Long Island, NY

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AHuxley

822 posts in 3499 days


#6 posted 10-31-2018 06:57 AM



Greco is a mainline industrial unit and back in the day when I dealt with them, > 40 years ago, only saw oil based paints and coatings.

- fly2low

Keep in mind the Graco Magnum line runs from DIY to light commercial but the OP didn’t mention his model. That said solvents should be a non-issue as they are perfectly capable of spraying oil based products.

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