FHB Logo Facebook LinkedIn Email Pinterest Twitter Instagram Plus Icon Close Icon Navigation Search Icon Navigation Search Icon Arrow Down Icon Video Guide Icon Article Guide Icon Modal Close Icon Guide Search Icon Skip to content
Subscribe
Log In
  • How-To
  • Design
  • Tools & Materials
  • Videos
  • Blogs
  • Forum
  • Magazine
  • Members
  • FHB House
  • Podcast
Log In

Discussion Forum

Discussion Forum

bleading pine nots

holmesabouthomes | Posted in Construction Techniques on March 29, 2012 10:55am

l have built porch columns with 1 buy pine boards.  sealed and two coats of paint but the knots are bleading through.  How do i get this to stop.

Reply

Replies

  1. calvin | Mar 30, 2012 06:57am | #1

    Good luck

    I don't believe you'll find a primer that will stop the knot sap movement in pine when the sun or heat contributes to the process.

    But I guess it's worth a try.

  2. DanH | Mar 30, 2012 07:43am | #2

    Seems like this is a question for the Nots Forum.

  3. aaron_agosto | Mar 30, 2012 09:12am | #3

    Ive had some problems with efflorescence in the past and my painter friend recommended using a white pigmented shellac. I imagine that would you help you there as well. I've also used that gripper primer in the past.

    1. IdahoDon | Mar 30, 2012 11:47pm | #4

      I'd second a shellac or shellac based primer for interior applications.

  4. Piffin | Mar 31, 2012 08:48am | #5

    Calvin is right that if there is sap bleeding, there iss little you can do, but if this is just shadowing showing where the knots are, you need a shellace based sealer to hide, sometimes 2-3 coats for bad ones, then your fininsh paint over. You only need to spot prime on the bad spots.

    Shellace based dries fast, and you use denatured alcohol to clean the brush - or use a disposable brush and leave it in the can between coats.

     or you can get a spray can if there are only a ouple of small spots.

  5. User avater
    MarkH | Mar 31, 2012 09:21am | #6

    I use a heat gun to heat the knots first so they release some of the gum.  Then clean up with acetone before priming.

  6. User avater
    hammer1 | Apr 01, 2012 11:06am | #7

    The traditional method has been to scrape then wipe off excess sap with a solvent, such as mineral spirits. Apply a minimum of two spot coats of pigmented shellac, apply an over all coat of an oil based primer, then paint. How well this works will depend on the amount of sap in knot. Generally it will work well for a number of years. When it's time to repaint, sand the knots and repeat the process. It's the properties of shellac that seal the sap but the spot primes will flash through paint, therefore, the overall primer after spot priming.

Log in or create an account to post a comment.

Sign up Log in

Become a member and get full access to FineHomebuilding.com

Video Shorts

Categories

  • Business
  • Code Questions
  • Construction Techniques
  • Energy, Heating & Insulation
  • General Discussion
  • Help/Work Wanted
  • Photo Gallery
  • Reader Classified
  • Tools for Home Building

Discussion Forum

Recent Posts and Replies

  • |
  • |
  • |
  • |
  • |
  • |
View More Create Post

Up Next

Video Shorts

Featured Story

Balancing Density and Privacy in Los Angeles

Four 2200-sq.-ft. detached homes provide flexible open-plan housing on this Los Angeles block.

Featured Video

Video: Build a Fireplace, Brick by Brick

Get an overview of the process of creating a traditional-style fireplace that burns well and meets current building codes from experienced mason Mike Mehaffey.

Related Stories

  • Podcast 549: Energy Upgrades, Chimney Inspections, and Questions About a Home You Might Buy
  • Podcast 549: Members-only Aftershow—Patios vs. Decks
  • Podcast 548: PRO TALK With Design/Build Operations Manager Jessica Bishop-Smyser
  • Strategies for Venting a Roof Valley

Highlights

Fine Homebuilding All Access
Fine Homebuilding Podcast
Tool Tech
Plus, get an extra 20% off with code GIFT20

"I have learned so much thanks to the searchable articles on the FHB website. I can confidently say that I expect to be a life-long subscriber." - M.K.

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

BOOKS, DVDs, & MERCH

Shop the Store
  • 2022 Fine Homebuilding Archive
    Buy Now
  • Code Check Building 4th Edition
    Buy Now
  • 2023 Tool Guide
    Buy Now
  • Pretty Good House
    Buy Now
  • Shop the Store

Fine Homebuilding Magazine

  • Issue 314 - April/May 2023
    • 7 Options for Countertops
    • Tool Test: Wood-Boring Bits
    • Critical Details for Ductless Heat Pumps
  • Issue 313 - Feb/March 2023
    • Practical System for a Seismic Retrofit
    • Fine Homebuilding Issue #313 Online Highlights
    • Practical System for a Seismic Retrofit
  • Issue 312 - Dec 2022/Jan 2023
    • Tool Test: Cordless Tablesaws
    • Gray-Water System for a Sustainable Home
    • Insulate a Cape Roof to Avoid Ice Dams
  • Issue 311 - November 2022
    • 7 Steps to a Perfect Exterior Paint Job
    • Options for Smarter Home-Energy Tracking
    • The Fine Homebuilding Interview: James Metoyer
  • Issue 310 - October 2022
    • Choosing a Tile-Leveling System
    • Choosing Between HRVs and ERVs
    • Custom Built-in Cabinets Made Easy

Fine Homebuilding

Follow

  • twitter
  • facebook
  • instagram
  • pinterest

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Membership & Magazine

  • Online Archive
  • Start Free Trial
  • Magazine Subscription
  • Magazine Renewal
  • Gift a Subscription
  • Customer Support
  • Privacy Preferences

Taunton Network

  • Green Building Advisor
  • Fine Woodworking
  • Fine Gardening
  • Threads
  • About
  • Contact
  • Advertise
  • Careers
  • Copyright
  • Terms of Use
  • Site Map
  • Do not sell or share my information
  • Privacy Policy
  • Accessibility
  • California Privacy Rights

© 2023 The Taunton Press, Inc. All rights reserved.

X
X
This is a dialog window which overlays the main content of the page. The modal window is a 'site map' of the most critical areas of the site. Pressing the Escape (ESC) button will close the modal and bring you back to where you were on the page.

Main Menu

  • How-To
  • Design
  • Tools & Materials
  • Video
  • Blogs
  • Forum
  • Reader Projects
  • Magazine
  • Members
  • FHB House

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Podcasts

  • FHB Podcast
  • ProTalk

Webinars

  • Upcoming and On-Demand

Popular Topics

  • Kitchens
  • Business
  • Bedrooms
  • Roofs
  • Architecture and Design
  • Green Building
  • Decks
  • Framing
  • Safety
  • Remodeling
  • Bathrooms
  • Windows
  • Tilework
  • Ceilings
  • HVAC

Magazine

  • Current Issue
  • Past Issues
  • Magazine Index
  • Subscribe
  • Online Archive
  • Author Guidelines

All Access

  • Member Home
  • Start Free Trial
  • Gift Membership

Shop the Store

  • Books
  • DVDs
  • Taunton Workshops

More

  • FHB Ambassadors
  • Reader Projects
  • Podcast
  • FHB House
  • Customer Support

Account

  • Log In
  • Join

Newsletter

Get home building tips, offers, and expert advice in your inbox

Signing you up...

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
See all newsletters
See all newsletters

Follow

  • twitter
  • facebook
  • instagram
  • pinterest

Join All Access

Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features.

Start Your Free Trial

Subscribe

FHB Magazine

Start your subscription today and save up to 70%

Subscribe

We hope you’ve enjoyed your free articles. To keep reading, become a member today.

Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine.

Start your FREE trial

Already a member? Log in