Preloading And Cleaning A Graco Sprayer

Discussion in 'Painters' Talk' started by bradleyheathhays, Sep 23, 2018.

  1. bradleyheathhays

    bradleyheathhays New Member

    I need some advice on how to properly 'pre-rinse' and then clean out my Graco 490 sprayer depending on what material you want to spray.

    Recently I've learned that to clean out whatever liquid you've got in there for longer term storage, first you need clean it out by running something through it that's similar to what you'll be spraying. For example if antifreeze is in it you'd want to run lacquer thinner through before spraying a lacquer finish. When you're finished spraying you'd then run lacquer thinner through again to clean out, and then maybe run some mineral spirits through to clean the lacquer thinner out. Does this sound about the right pre-rinse and cleaning procedure for spraying lacquer?

    Also I need advice on how to pre-rinse and clean the machine when spraying an oil based polyurethane.

    Latex would be simple. I assume to rinse with water first and then clean afterward with soapy water.
  2. bradleyheathhays

    bradleyheathhays New Member

    Please let me know if any of this is wrong...

    Assuming it's stored with anti-freeze in it..

    If you're gonna spray an acrylic lacquer..
    - flush the anti freeze out with lacquer thinner
    - spray your lacquer
    - clean with lacquer thinner
    - load with mineral spirits to store

    If gonna spray oil-based polyurethane..
    - flush the anti freeze out with mineral spirits?
    - spray the polyurethane
    - clean with mineral spirits and store with mineral spirits

    If spraying latex...
    - pre-flush with water
    - spray the latex
    - flush with water and store with mineral spirits or anti freeze

    All this sound about right?
  3. Peter208

    Peter208 Active Member

    Your be in bed and knocking out the zzz now Brad but anyway, two things;
    What does the handbook say and try a US diy site

    Have a nice day

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