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epoxy!

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Blog entry by learnin2do posted 09-03-2010 07:05 AM 1038 reads 0 times favorited 9 comments Add to Favorites Watch

I put too thick a first layer of epoxy (5 minute) in a knothole where i want to epoxy in a beetle on a stick (on a walnut & crepe myrtle rustic table).
-now what? it won’t set in the middle of the layer, and i wanted to drop it off in her yard to surprise her tomorrow!
-I’m afraid to add more layers.
-I poked at the bottom a little with a screw hoping to expose it to air.

-- christine



9 comments so far

View FirehouseWoodworking's profile

FirehouseWoodworking

629 posts in 1958 days


#1 posted 09-03-2010 08:59 AM

When you mix the two components of epoxy together, it creates an exothermic reaction, i.e., it gives off heat as it cures. It would therefore follow that if the epoxy won’t fully cure, then the reaction is not giving off heat. It would further follow that by adding cold, you would stimulate the heat production which is only caused by a continued reaction.

How about trying a chemical cold pack or one of those blue refreezable packs? I don’t think I’d try regular ice as the melt water might damage the wood.

Can’t guarantee it, but I can’t let ALL my college chemistry go to waste!

Good luck!

-- Dave; Lansing, Kansas

View tyskkvinna's profile

tyskkvinna

1308 posts in 1671 days


#2 posted 09-03-2010 02:27 PM

Generally if you make epoxy cold, it sets slower. If you make it hot, it sets faster. I know I’m suggesting the exact opposite of Dave.. but I’ve worked with a LOT of epoxy.

-- Lis - Michigan - http://www.missmooseart.com - https://www.etsy.com/people/lisbokt

View crank49's profile

crank49

3456 posts in 1656 days


#3 posted 09-03-2010 07:34 PM

quote: -I poked at the bottom a little with a screw hoping to expose it to air.

Epoxy does not need air to cure. If you measured properly and mixed the two components completely that is all that is needed.

Some of the slower epoxies need a minimum of like 75 degrees of heat to set within a reasonable time, but the fast ones make plenty of their own heat. You can usually speed the reaction up with heat or slow it down with cold. I got this information right out of the “System III” manual and from the book “All About Epoxy”. So Lis is correct.

If you have epoxy that is partially cured and has an area that won’t cure, it suggests the mix was not good, or perhaps the components were old. If that’s the case, you may be SOL, but I would try the heating route anyway. Maybe there is enough active material in the mix to cure with some added heat.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View FirehouseWoodworking's profile

FirehouseWoodworking

629 posts in 1958 days


#4 posted 09-03-2010 08:23 PM

Thanks Lis!

I wasn’t sure whether to apply heat or cold, I just tried to work through the logic.

But alas. Looks like all that college chemistry DID go to waste, after all. Go figure!

-- Dave; Lansing, Kansas

View rivergirl's profile

rivergirl

3198 posts in 1523 days


#5 posted 09-03-2010 11:29 PM

Once I used a hair dryer and sat it out in the sun. It worked for me?

-- Homer : "Oh, and how is education supposed to make me feel smarter? Besides, every time I learn something new, it pushes some old stuff out of my brain."

View learnin2do's profile

learnin2do

866 posts in 1536 days


#6 posted 09-04-2010 03:51 AM

WHOA, DAVE! -that is brainy!
=Lis & y’all -i think you are right. cause…i gave up when it had not set today and i got anxious &wanted to leave town and leave it on my friend’s lawn to surprise her. So I just filled the rest with hot glue gun glue…and then the epoxy cleared up like it was set.

-- christine

View rivergirl's profile

rivergirl

3198 posts in 1523 days


#7 posted 09-04-2010 01:06 PM

So christine, do you think it was the addition of the heat of the hot glue that caused the epoxy to set? I do. :)

-- Homer : "Oh, and how is education supposed to make me feel smarter? Besides, every time I learn something new, it pushes some old stuff out of my brain."

View BigTiny's profile

BigTiny

1664 posts in 1573 days


#8 posted 09-04-2010 04:18 PM

Ultraviolet light is supposed to work too.

-- The nicer the nice, the higher the price!

View learnin2do's profile

learnin2do

866 posts in 1536 days


#9 posted 09-06-2010 05:27 PM

-yeah, rg, but the glue gun glue was on the beetle and it is not very clear. I havn’t seen it since i left it and ran, but she said she can barely make it out.

-- christine

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