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Need a substance to use as grout

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Forum topic by Dave Witkus posted 637 days ago 784 views 0 times favorited 10 replies Add to Favorites Watch
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Dave Witkus

28 posts in 771 days


637 days ago

Topic tags/keywords: question

I have experimented with an old coffee table that I want to glue small Koa pieces to the the top of the table in a mosaic pattern. As you might know, most mosaic is done in tile and cement type grouts are used to fill the spaces between the small pieces that make up the design. But I’m using wood on wood and bathroom grout is not the desired material.

Is there a substance that can be spread out over the entire surface of the mosaic to fill all the spaces in between that does not shrink as badly as glue does. I also prefer it black so tintable epoxy was suggested but epoxy shrinks and is expensive. Any one know of something that will not shrink to use as grout?

aloha

dave

-- After you wipe away all the hype, who you really are is synonymous w how you treat people.


10 replies so far

View Clint Searl's profile

Clint Searl

1420 posts in 987 days


#1 posted 637 days ago

There’s an epoxy grout made for tile that would work.

-- Clint Searl.............We deserve what we tolerate

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patron

13001 posts in 1967 days


#2 posted 637 days ago

bondo with back ink or paint
don’t use as much hardener
so you have time to smooth it out
in the joints
after mixing

it sands well

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View alan coon's profile

alan coon

112 posts in 2339 days


#3 posted 637 days ago

patron is dead on.

-- Al, South E. Az., But it's a dry heat.

View Dave Witkus's profile

Dave Witkus

28 posts in 771 days


#4 posted 637 days ago

Never thought of bondo….this site is amazing…..thank patron.

-- After you wipe away all the hype, who you really are is synonymous w how you treat people.

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patron

13001 posts in 1967 days


#5 posted 637 days ago

another thing

seal the wood
with some spray pr brushed on poly or lacq
before the ‘grout’
so the wood doesn’t leach the black
it will sand off with the bondo later

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

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blackcherry

3154 posts in 2449 days


#6 posted 637 days ago

Well done patron on your suggestion…Happy Thanksgiving my friend…BC

View Wdwerker's profile

Wdwerker

332 posts in 859 days


#7 posted 637 days ago

I would glue my mosaic pattern in place first and just spray a little finish on the tops then spread the tinted bondo to fill in the gaps. Do a little test run with the tinting and a few scraps so you know how it will behave.

-- Fine Custom Woodwork since 1978

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Clint Searl

1420 posts in 987 days


#8 posted 637 days ago

View Promod1385's profile

Promod1385

19 posts in 699 days


#9 posted 629 days ago

You can use mastic (its a pre mixed tile glue) or you can spread PL in a pinch (i like the PL premium variety most for this task) be advised you wont get much build with it as it goes on very thin. Regular PL can go on thicker and create more build.

I am a fourth generation tile setter and would recommend epoxy grout as well. Its not a very forgiving material, you will want to do smaller areas than you would with traditional grout, work fast and do not allow any of the grout to dry on the material or it will be there forever! They sell a small Kobalt brand margin style float at Lowes. Its a good little gum rubber float that would be suited well for this task.

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runswithscissors

904 posts in 651 days


#10 posted 628 days ago

Epoxy shrink? It’s not supposed to. It does run like honey (think about when you were a kid, had a piece of toast with a hole in the middle, and you put honey on it; It’s that bad). One way is to thicken it. I use wood flour (sanding dust), then tint it with powdered graphite. WEST system epoxy co. puts out powdered graphite in a pint or qt. sized can. Barely weighs anything. A small amount will blacken a lot of epoxy. And when it’s cured, there’s no graphite rubbing off on your wife’s doily. I’d put it in the grooves with a glue syringe.

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