LumberJocks

When to fill a knot with epoxy? Is it always necessary?

  • Advertise with us

« back to Finishing forum

Forum topic by Dagobah posted 03-15-2017 12:15 AM 1784 views 0 times favorited 11 replies Add to Favorites Watch
View Dagobah's profile

Dagobah

80 posts in 1712 days


03-15-2017 12:15 AM

I’ve seen plenty of videos about filling knots with epoxy, but haven’t seen anything addressing when to fill. Is it always necessary?

I’m building a couple floating shelves for our kitchen. One of the boards has a knot with a crack partially through. Do I risk the board being unstable if I don’t fill the knot, or is it something I really need to worry about? It’s just a shelf after all.


11 replies so far

View Madmark2's profile

Madmark2

2476 posts in 1637 days


#1 posted 03-15-2017 12:23 AM

Pine has knots & sap. If you’re not going to plane it should be ok.

M

-- The hump with the stump and the pump!

View Dagobah's profile

Dagobah

80 posts in 1712 days


#2 posted 03-15-2017 12:25 AM



Pine has knots & sap. If you re not going to plane it should be ok.

This is a 1.5” thick piece of walnut. I’ve already planed and sanded, ready for finish. Just now realized I should double check leaving the crack before I went any further.

View Dagobah's profile

Dagobah

80 posts in 1712 days


#3 posted 03-15-2017 12:28 AM

The knot in question:

View johnstoneb's profile

johnstoneb

3167 posts in 3222 days


#4 posted 03-15-2017 12:38 AM

It’s your choice. If it is going to be exposed might leave it alone or fill it with a colored epoxy to draw attention to it your choice. The only time you really need to glue or epoxy a know is if it is loose.

-- Bruce, Boise, ID

View Dave Smith's profile

Dave Smith

94 posts in 1513 days


#5 posted 03-15-2017 12:43 AM

Walnut is a very stable wood. Should be ok unless subjected to extremes of humidity and temperature. That is a beautiful piece of wood! I’m not sure of scale/size from the picture, but have you considered a small butterfly of a complementary wood. Might look nice.

-- Dave Smith - If our phones fall, we panic. If our friends fall, we laugh.

View papadan's profile

papadan

3584 posts in 4417 days


#6 posted 03-15-2017 01:31 AM

I leave all knots as they are, just natural character.

View DirtyMike's profile

DirtyMike

637 posts in 1951 days


#7 posted 03-15-2017 02:03 AM

I would advise against using a dutchman in a knot. you could be left with a mess in a hurry. I mix up copper powder and walnut sawdust to fill my walnut cracks and knots.

View RogerM's profile

RogerM

807 posts in 3448 days


#8 posted 03-15-2017 02:47 AM

I fill cracks in black walnut knots with epoxy mixed with lamp black.

-- Roger M, Aiken, SC

View RobS888's profile

RobS888

2829 posts in 2894 days


#9 posted 03-15-2017 02:53 AM

It wouldn’t take that long to fill it with epox and sand. I fill all cracks with epoxy before milling.

-- I always knew gun nuts where afraid of something, just never thought popcorn was on the list.

View HokieKen's profile (online now)

HokieKen

17226 posts in 2187 days


#10 posted 03-15-2017 05:10 PM

For me, it depends on whether the crack is confined to the knot. In other words, could you remove the knot with a chisel cleanly and if so, would the crack be gone? If not, I like to fill the crack to try to prevent further checking.

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

View HorizontalMike's profile

HorizontalMike

7915 posts in 3963 days


#11 posted 03-15-2017 05:24 PM

This is what I did on a walnut box. I saved sawdust from my cuts and mixed it with TB-3 and used it as a filler. Since the sawdust was from this piece of wood, it worked out well.

While it did not end up perfectly smooth, it did/does take the emphasis off of the crack and it blends well. Just my 2-cents worth…

-- HorizontalMike -- "Woodpeckers understand..."

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com