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Airless paint sprayer protectant? #5259891 11/06/19 12:12 PM
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nthach Offline OP
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My parents have a Graco 190ES paint sprayer they use once in a blue moon. I have the sprayer stored and protected with a mix of paint thinner and a shot or two of whatever motor oil I have on hand. Solvents evaporate and I need to redo the job again this weekend as I noticed the bucket holding the paint thinner/oil mix is just barely covering the pickup screen on the pump's inlet.

I know Graco has their own protectant - Pump Armor but the SDS shows that it's like non-silicated antifreeze with ethylene glycol, dipotassium phosphate and sodium nitrite. It's close to Toyota's red coolant without the OAT. Some people use RV antifreeze to store their paint sprayers.

Since I have a uncomfortable feeling my dad will carelessly use the sprayer without a water purge to flush out the solvent/oil storage solution and I have a gallon of Toyota red coolant left over I might just use that to store the sprayer and all that needs to be done before spraying is to flush the pump. I'll use a 2 gallon bucket with a hole drilled in the lid to prevent an accidental spill or poisoning. If I can find a cap that has the same threads as the inlet screen, I can simply turn the sprayer upside-down and fill it with the storage solution and seal it.

Will this work or just stick to what I've been doing with the paint thinner and oil?

Re: Airless paint sprayer protectant? [Re: nthach] #5259900 11/06/19 12:31 PM
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demarpaint Offline
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I use mineral spirits after a complete and through cleaning. They are stored inside. I have three machines all stored the same way. As my business has shifted more toward high end wall covering installation the airless sprayers get used less and less. Last year I rustproofed the under carriage of my Rubicon with a Titan sprayer that wasn't used in probably ten years. The insides of the machine were clean and plenty of mineral spirits exited the unit. The pick up tube is cleaned by hand first. Next the machine gets cleaned by running either soap and water through it for latex, mineral spirits for oil base products. Once the unit is spraying clean soap and water or mineral spirits I give it a final rinse with mineral spirits. Then I relieve the pressure after turning it off, roll up the hose and store it with the gun attached minus the tip. There is enough mineral spirits remaining in the unit to keep it problem free for a very long time. Finally I wrap the gun and pick up tube in a plastic bag to keep dirt out.


God Bless Our Troops

Re: Airless paint sprayer protectant? [Re: nthach] #5259954 11/06/19 01:42 PM
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WhyMe Offline
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i think they need stuff in there just to keep it from freezing in case its left in a unheated area , which a lot of them are .

Re: Airless paint sprayer protectant? [Re: WhyMe] #5259995 11/06/19 02:31 PM
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demarpaint Offline
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Originally Posted by WhyMe
i think they need stuff in there just to keep it from freezing in case its left in a unheated area , which a lot of them are .

They also don't want residual paint that might be remaining from a poor cleanup hardening and plugging things. FTR mineral spirits won't freeze either.


God Bless Our Troops

Re: Airless paint sprayer protectant? [Re: demarpaint] #5260111 11/06/19 05:26 PM
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nthach Offline OP
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Originally Posted by demarpaint
I use mineral spirits after a complete and through cleaning. They are stored inside. I have three machines all stored the same way. As my business has shifted more toward high end wall covering installation the airless sprayers get used less and less. Last year I rustproofed the under carriage of my Rubicon with a Titan sprayer that wasn't used in probably ten years. The insides of the machine were clean and plenty of mineral spirits exited the unit. The pick up tube is cleaned by hand first. Next the machine gets cleaned by running either soap and water through it for latex, mineral spirits for oil base products. Once the unit is spraying clean soap and water or mineral spirits I give it a final rinse with mineral spirits. Then I relieve the pressure after turning it off, roll up the hose and store it with the gun attached minus the tip. There is enough mineral spirits remaining in the unit to keep it problem free for a very long time. Finally I wrap the gun and pick up tube in a plastic bag to keep dirt out.

That has been my MO and last time I sprayed the pump worked like the day I put it away.

I just need to "build a better mousetrap" to prevent a well-meaning but occasionally clueless dad from ruining the works. Hence why looking into coolant or Pump Armor.

Re: Airless paint sprayer protectant? [Re: WhyMe] #5260113 11/06/19 05:30 PM
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nthach Offline OP
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Originally Posted by WhyMe
i think they need stuff in there just to keep it from freezing in case its left in a unheated area , which a lot of them are .

That's what I get - which also explains the phosphate and nitrite content as a corrosion inhibitor just like coolant. Glycols also serve as a humectant. Since airless sprayer pumps have leather and Teflon/P-tex packings, the glycol in a pump protectant(or oil if paint thinner is used) serves to keep the leather "moisturized".

Re: Airless paint sprayer protectant? [Re: nthach] #5260326 11/06/19 09:35 PM
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Don't over think it- get a gallon of diesel fuel, when you think it's clean enough switch to the diesel (seperate bucket) then turn it to "prime" let the diesel circulate for a couple of minutes. Lubes everything & won't let anything inside corrode

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