Slab hole filling

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Forum topic by drewm873 posted 12-19-2016 11:34 PM 783 views 0 times favorited 5 replies Add to Favorites Watch
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83 posts in 3813 days

12-19-2016 11:34 PM

Hey Gang. I need help. I’m working on a slab bench but there was a lot of rot in two spots, which I cleaned up, and I want to fill it in with epoxy. In the past I used West System epoxy but the one hole is is just way too big to fill the whole thing with epoxy. Is there something anyone has used that can be used to fill the holes and give it some flare to stand out? Pack it with saw dust and epoxy over? I know you can layer the epoxy coats but I’ll be here until the cows come home. ha The far hole in the picture is the one I’m more concerned about. Curious on your thoughts and advise. :)


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5 replies so far

View Snowbeast's profile


157 posts in 2622 days

#1 posted 12-20-2016 12:11 AM

Try packing it with coffee grounds then saturate with very thin consistency CA glue. You can build up layers until just shy of the surface and then coat that with your epoxy. This will create a solid filling that should last longer than the bench itself.

View xwingace's profile


229 posts in 3872 days

#2 posted 12-20-2016 12:30 AM

But it would look SO COOL if you filled all that in with the clear stuff! But yeah, it would take you a year lol.

-- I'm not as good as I once was, but I'm as good once as I ever was.

View drewm873's profile


83 posts in 3813 days

#3 posted 12-20-2016 01:18 AM

Coffee grounds sounds interesting, I’ll have a look into that one. Thanks

Cool, expensive and a long time to dry. lol

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View papadan's profile


3584 posts in 4652 days

#4 posted 12-20-2016 01:18 AM

Lay strips of fiberglass in the voids and pour resin on top of them and let soak in. Will set hard and be pretty much clear. Then use you epoxy to finish the final layer. whole thing shouldn’t take but an hour or so.

View marc_rosen's profile


180 posts in 4465 days

#5 posted 12-20-2016 02:22 AM

Hello Drew, You can fill that void with epoxy and similar to Xwingace’s response it will take some time but you can pour about a quarter inch at a time until it’s filled. I did that this summer on a walnut slab that had through and blind voids. It took two days to pour but I had transparent sections that looked really cool.

I got some great advice from calling the folks at West Systems. The guy I talked to said I should keep the layers less than a quarter inch and wait until the previous layer is tacky or slightly rubbery before I pour the next layer. I poured my last layer on Day 1 at 1130 PM and the next morning I poured at 6 and there was no visible interface. West Systems said there is still a chemical bong between layers if the previous layer has not completely cured.

Another good tip they offered was to use a fine spray of 100% ethanol (I think methanol was mentioned too) in place of a torch to eliminate bubbles. This worked great as you can see the bubbles disappear on the surface immediately and it was especially efficient to get the bubble out below the surface of the wood where flaming might have been a small problem getting into tight spaces.

Based on the other stuff you made in your Projects page I think you can do the epoxy route and have a “way Cool” bench when it’s done. Regardless of which way you fill it I’m certain we’ll see a nice finished project here.


-- Windsurfing, Woodworking, Weaving, and Woodducks. "Most woodworkers are usually boring holes"

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