Troubleshooting a Leaky Spraygun Tip

      There are several reasons why that gun might drool a little. December 10, 2007

I have a Kremlin pump with the MX gun. As I was spraying today, when I would stop, a little fluid would leak out of the tip of the gun, with little air bubbles forming in the excess liquid. Anyone know what's causing this? I sprayed for a little bit and it cleared up, but it was a nuisance while it was happening.

Forum Responses
(Finishing Forum)
From contributor T:
For the fluid leaking out of the tip, it sounds like you are ready to replace the seat. The seat is what the ball seats against to stop the flow of fluid when the trigger returns to the closed position. If the seat is clogged, dirty, or worn from abrasion of the fluid, it needs to be cleaned or replaced. The seat is in the nozzle of the gun and is removed with a flat head screwdriver. The part is inexpensive and designed as a wear part. You can get a seat in Delrin, stainless steel, or carbide. Select the appropriate seat for your product. It also sounds like you may need to replace the tip seal. That is the white o-ring behind the tip (or black with a screen on tips smaller than 06-XXX). This seal prevents the fluid from leaking out of the air passages of the air cap. If you are seeing fluid in those passages, replace this seal as well.

From contributor A:
Sounds like you had a minor clog in the tip or the ball needle that stopped it from seating properly. As you sprayed it worked itself loose, maybe. Taken the gun apart lately?

From the original questioner:
I'll take the gun apart to investigate. I didn't want to do it at the time because I was in the middle of spraying and didn't want to break everything down. Thank you.

From contributor M:
This has happened to me before. I was in such a rush that I didn't dry all the thinner off the screw tip. Then I saw it dripping just as I started spraying. Had to stop and clean it with thinner again and dry it better with air. Worked fine after. This has happened a few times.

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?

Have you reviewed the related Knowledge Base areas below?
  • KnowledgeBase: Knowledge Base

  • KnowledgeBase: Finishing

  • KnowledgeBase: Finishing: General Wood Finishing

    Would you like to add information to this article? ... Click Here

    If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to
    review our Forum Guidelines.

    Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

    When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

    Return to beginning of article.

    Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement

    Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

    Contact us to discuss advertising or to report problems with this site.

    To report a problem, send an e-mail to our Webmaster

    Copyright © 1996-2017 - WOODWEB ® Inc.
    All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
    Review WOODWEB's Copyright Policy.

    The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

    WOODWEB, Inc.
    335 Bedell Road
    Montrose, PA 18801

    Contact WOODWEB

  • WOODWEB - the leading resource for professional woodworkers

      Home » Knowledge Base » Knowledge Base Article