Finishing Over Pine Knot Bleed-Through

      How to seal and cover knots before refinishing. November 15, 2011

I had somebody ask to bid on a refinish job today that I need a little input on. It is a five year old kitchen with a pigmented lacquer on pine. It looks like they didn't prime the pine and about a week after it was installed, all the sap from the knots bled through. She wants the refinish to be the same colour. I was hoping I could just prime it and spray post-cat pigmented lacquer over it. Has anyone run into this before?

Click here for higher quality, full size image

Forum Responses
(Finishing Forum)
From contributor L:
White vinyl primer for the first coat, and then a pigment coat.

From contributor A:
You will do this work on-site?

From the original questioner:
Thankfully I will be able to get about 95% of it into my shop. The only stuff on site would be the crown and one gable.

From contributor M:
Don't forget where the knots are if you are doing a rub through finish again. Don't sand where the knots are!

From contributor A:
BIN shellac primer should stop the bleeding.

If the BIN doesn't work you will have to carve the tops off the offensive knots, then fill them with Bondo. Then prime the whole project with BIN or Clawlock (cat primer) to even out the defects.

From contributor J:
Are those knots still tacky after these years of being finished? Denatured alcohol will help reduce that. Also the BIN product should cover that. I used it under lacquer and light coats of pre-cat. But I am not sure that it will hold up to a post cat - conversion varnish or post cat lacquer. (The original finish or the BIN product.) Catalyst in the post catalyzed CVs and post cat lac are a lot stronger than the pre cat. You may end up with lifting, wrinkles, or a crackle finish. Do you know if a post cat finish was used on it? If it wasn't, XIM makes a product called UMA. It sticks to anything (with appropriate sanding prep), covers well, sands well, and after 48 hours you will be able to use a post cat primer or post cat topcoat if so desired.

From the original questioner:
Thanks everyone for your posts. Just found out today that it looks like she is going to go with a new build. At least I learned something from you guys.

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: Refinishing

    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 © 1996-2019 - 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