Dealing with Pitch Pockets

      Here's a nice handful of workable methods for preventing bleed-through of pitch from pitch pockets in softwood lumber. January 8, 2010

Question
I am trying to seal or stabilize a pitch pocket that is in VG Fir. I have tried Bondo, as I thought it would set fast enough to prevent it from bleeding through, but it ended in failure. This is an exterior door that is to be finished with a low sheen in black. Any ideas out there?

Forum Responses
(Finishing Forum)
From contributor J:
Bondo is actually too hard and will start to show cracks around the repair after a few heating/cooling seasons as the wood moves. Glazing putty - a mix of linseed oil and chalk or ground limestone used to set window glass - has a long history as an exterior wood filler under paint.



From contributor R:
Why not route it or drill it out, put in a "dutchman" and proceed with your finishing schedule?


From the original questioner:
Thanks for the response. I did proceed with the dutchman. Sometimes it just looks you in the face and you don't see it in front of you.


From contributor T:
Had a large pitch pocket on the underside of a table, and with a sharp knife, cut out the hard and soft areas, then used hotmelt glue, filled area and smoothed out. No more pitch. The glue dried clear - you really have to look for that patch.


From contributor I:
Another is to use West System. Clean out the pitch with solvent and then fill. If you are clear coating, you can tint the epoxy to make it look like wood grain.


From Professor Gene Wengert, forum technical advisor:
The pitch that would be soft at room temperature can be evaporated by heating the area to 160 F to 180 F for several hours - maybe 12. The pitch that remains will be very hard at room temperature and will not bleed. Normally, this heating is done during kiln drying.

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 © 1996-2014 - 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