two part epoxy

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Forum topic by DocSavage45 posted 01-08-2016 07:47 AM 1336 views 0 times favorited 30 replies Add to Favorites Watch
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8546 posts in 2836 days

01-08-2016 07:47 AM

Topic tags/keywords: question tip epoxies

Looking for advice on brands and times for setting for 2 part epoxy when used as a filler for splits and cracks in Hardwood.

Did a search and found some preferences. Have also watched a couple of YouTube videos. Checked out my local ( Menards) BIG BOX STORE today but only found one small kit and no real advice from a eager but ignorant new guy.

Thought I ask the LumberJocks to see what possibilities you all might suggest and advise on!


As always humor is welcome!!!!!

-- Cau Haus Designs, Thomas J. Tieffenbacher

30 replies so far

View Mark Wilson's profile

Mark Wilson

2123 posts in 1057 days

#1 posted 01-08-2016 09:02 AM

This is the place to come for help with such things, Tom. Not the ignorant little punks at Menard’s, HD, Lowe’s, etc.
That little kit you looked at was probably Loktite 5-minute. If so, it’s what I use. A half-hour is good. Heck, I’m usually on it within a half-hour. What you may not expect, though, is the really hard “river, or dam, of epoxy” you’re gonna be crossing with your tools. It’s worse than hitting a knot. It’ll make your tool bounce, if you don’t keep it well-skewed. It’ll bounce, even then. But, at least, when skewed, it’s less likely to dig in on the other side.
Probably stuff you already know. The answer to your question is twenty or thirty minutes.
The thing says you posted this at 7:47, Friday morning. Are you in England?

-- Mark

View Monte Pittman's profile

Monte Pittman

29216 posts in 2332 days

#2 posted 01-08-2016 12:19 PM

Strictly my opinion, but Devcon clear epoxy is all I use. Sets up clear and hard enough to sand in an hour. I get it at Lowes.

-- Nature created it, I just assemble it.

View Tennessee's profile


2870 posts in 2508 days

#3 posted 01-08-2016 12:39 PM

I use in my shop the 15 minute, 3500PSI pound Locktite. I buy the larger containers, I think 4 oz. each.

But the one time I tried to use it as a filler for cracks on a bowl I was turning, I found it to flow very poorly, and like Mark said, it is like hitting concrete when you try to turn it. It seemed like the wood could break off around it, rather than the epoxy cutting under the tool. I sharpen my tools with a Wolverine, and usually can get beautiful thin shavings – not so with the epoxy I used.

I also am looking for something more forgiving. I’ve actually thought of trying polyester resin, like the pen people do when making those pen blanks with little items like watch gears inbedded, but I don’t know if it would have the strength to hold a bowl crack. I also wonder about keeping it in the crack until it has time to set a bit.

-- Tsunami Guitars and Custom Woodworking, Cleveland, TN

View jdh122's profile


1008 posts in 2811 days

#4 posted 01-08-2016 01:01 PM

I use dollar store 5-minute epoxy in the two-part plunger tubes for this. I wouldn’t necessarily trust it for joinery, but find it works perfectly for filling knots and cracks. As for the issue of how to level it after it’s dried, I’ve had more success with a card scraper than with either a sander (clogs almost instantly) or a handplane.

-- Jeremy, in the Acadian forests

View JoeinGa's profile


7736 posts in 2000 days

#5 posted 01-08-2016 01:04 PM

The thing says you posted this at 7:47, Friday morning. Are you in England?

- Mark Wilson

On my computer it shows he posted it at ”01-08-2016 02:47 AM ”

And Mark, for reference, here’s the post time stamp on yours ”#1 posted 01-08-2016 04:02 AM ”

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View doubleDD's profile


7379 posts in 2037 days

#6 posted 01-08-2016 02:16 PM

Good post. I will have to write some of this down.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View Jim Finn's profile

Jim Finn

2656 posts in 2915 days

#7 posted 01-08-2016 02:27 PM

I get my epoxy at my local hobby shop. Super glue there also. Larger quantities, bigger bottles. I use 30 min Epoxy myself.

-- Website is No PHD just a DD214 and a GED

View a1Jim's profile


117086 posts in 3571 days

#8 posted 01-08-2016 03:02 PM

Morning Tom
The low-cost 5-minute epoxy works well on knots as long as you do it properly and for some joinery that is hard to clamp where you can actually hold the pieces together until it sets. In a test of glues on joinery Fine Woodworking had a test a while back they still rated wood glue stronger on most joinery than any of the other glues ,including epoxy,polyurethane (gorilla glue) and super glues.

-- wood crafting & woodworking classes

View GregTP's profile


62 posts in 937 days

#9 posted 01-08-2016 03:27 PM

I used two part epoxy that you can get at most home stores in a kit for bar top finishing.

It is a bit softer than a regular eppoxy so it cut relatively well with both a plane and a scraper. And it comes in 30oz (?) bottles so there is a lot of it if you need to fill a big crack.

In my case it was for a live edge table slab that had a series of knots and cracks right down the middle. it isn’t holding any real tension so as long as it stays put I am happy with the holding power

-- From exercise machine warning label: "Step ladders can cause injury and even death; the ROM machine is more dangerous than a stepladder"

View ThomasChippendale's profile


244 posts in 926 days

#10 posted 01-08-2016 03:29 PM

To fill cracks and knots I use the dollarstore 5 minutes epoxy and add pigments such as rex oxide for red etc…but mainly, before if fully cures, say after 3-7 minutes, I scrape it flush with the surface with a scraper or a razor blade.

-- PJ

View geekwoodworker's profile


373 posts in 1454 days

#11 posted 01-08-2016 04:19 PM

I like to use an epoxy that dries clear and gives me sufficent time to mix and put it in the cracks. For instance I used 5 min once and it hardened before I got all cracks filled. I like to mix in sawdust with my epoxy to either match the wood or the knot so sometimes I need more mixing time. I have never had a problem with sanding or scraping epoxy ( 5min or longer set times).


View bondogaposis's profile


4717 posts in 2345 days

#12 posted 01-08-2016 04:44 PM

T-88 is my go to brand. It is structural and has great gap filling properties. Link here. It is also a lot cheaper than buying those 1/2 oz tubes for $5.

-- Bondo Gaposis

View BinghamtonEd's profile


2298 posts in 2363 days

#13 posted 01-08-2016 05:01 PM

I just filled some knots and beetle holes in some spalted maple last week. I used Loctite 5-minute clear epoxy from Lowes. The knots were relatively small, and the bug holes even smaller. The only thing I didn’t like about the Loctite was that it doesn’t flow well. I’m not sure what an appropriate thinning agent would be for it, maybe someone here does.

Note, if your shop is around 50-55 degrees like mine, it takes waaay longer than 5 minutes to fully cure. I left mine over night, because after a couple hours they were still slightly tacky to the touch. I used a block plane skewed at an angle to knock down the overfilled areas, then sent everything for one last pass through the planer.

If I were doing anything more substantial, I would probably try one of the other epoxies that people suggest for better flow.

-- - The mightiest oak in the forest is just a little nut that held its ground.

View TheDane's profile


5423 posts in 3656 days

#14 posted 01-08-2016 05:25 PM

I don’t use much epoxy, and have had the 5-minute Loctite kits go bad before I could use it up.

Lately, I have been using Gorilla clear epoxy in the twin-tube syringes.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View MrUnix's profile


6698 posts in 2192 days

#15 posted 01-08-2016 05:34 PM

Pretty much any epoxy will work… although there are different mixes sold depending on what your intended use is. The stuff sold in the syringes is thickened, so it doesn’t flow very well (although heating it up a bit can help with that). Others, like West Systems are more fluid like and will flow easier into small cracks, but that also means extra care must be taken to keep it contained. They all machine easily once cured, and all can be mixed with various materials to alter it’s color and consistency, including adding stuff like turquoise or even luminescent powder for a cool glow in the dark effect :)

I don’t use much epoxy, and have had the 5-minute Loctite kits go bad before I could use it up.
- TheDane

That is curious… two part epoxy has an extremely long shelf life as long as it’s kept in it’s original containers and not exposed to air… you must have either left the cap off or had that stuff for a few decades :) I keep one of those syringe things in the tool box of my truck, ready for use on the odd ball repairs I might run into… and even in that environment, the tubes last years until I finally use them up and they get replaced with another one.


-- Brad in FL - In Dog I trust... everything else is questionable

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