LumberJocks

UV in the Shop #3: Titebond II Fluorescent to the Rescue

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Blog entry by Rich posted 03-03-2018 05:24 AM 2794 reads 1 time favorited 11 comments Add to Favorites Watch
« Part 2: Finding Flaws in Finish Part 3 of UV in the Shop series Part 4: Fluorescent Lumber Crayons »

NOTE: Since writing this blog entry I’ve experimented with mixing Titebond II Fluorescent with plain Titebond II and found that it still glows quite brightly under UV light. Since the fluorescent product costs more I now mix it 50/50 with regular Titebond II.

——————————————————————————————————————-

I’m sure that readers of this blog have thought hey, that’s cool that hide glue fluoresces, but I don’t use hide glue. So what’s in it for me?

Well, who knew that Franklin made a Titebond glue with fluorescent dye added? I sure didn’t. But they do!
It’s Franklin 2316 Titebond Fluorescent Glue.

I’ve read countless articles about glue residue and how to expose it. Conventional wisdom is to dampen it with warm water and the color will change. I’ve used that technique and it works to a degree. I’ve still had occasions where I was fooled and glue residue reared its ugly head.

With this Titebond II glue with fluorescing dye, you can see the glue residue using a $10 UV flashlight.

Here are some images to show its value:

These are a couple of boards glued up with this glue

It looks just like Titebond II. But with a UV flashlight you see this

Here is the backside that was laying on the mat and got glue squeeze-out smeared on it

Looks OK in regular light, but here is the glue residue exposed by the UV light

Honestly, in a typical situation, I’d miss that glue residue. But using Titebond II fluorescent with a UV flashlight exposes it.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner



11 comments so far

View EarlS's profile

EarlS

4541 posts in 3461 days


#1 posted 03-03-2018 11:55 AM

Huh..never would have thought about getting glue that glows in UV. Makes a lot of sense considering the amount of work it takes to sand out a missed glue mark after the first coat of finish goes on.

Might have to look into that when the current glue bottle runs out. I’ll also be looking for a UV flashlight next time I’m on Amazon..

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View 000's profile

000

2859 posts in 2012 days


#2 posted 03-03-2018 03:01 PM

Interesting, I’ve never seen that before.
Glue sure does show up good under the light.
Does it make a difference if the glue is wet or dry?

( I’m just trying to figure out how all that Titebond got on my keyboard ) :>/

View Rich's profile

Rich

6919 posts in 1702 days


#3 posted 03-03-2018 03:54 PM


Interesting, I ve never seen that before.
Glue sure does show up good under the light.
Does it make a difference if the glue is wet or dry?

( I m just trying to figure out how all that Titebond got on my keyboard ) :>/

- jbay

Yeah, I’m always getting the pages of my Fine Woodworking magazine stuck together. The last two photos show the backside where it was laying on the mat. That’s completely dried glue and it lights up pretty brightly. The ordinary light shot in the first photo was intended to show that it looks just like Titebond. I honestly can’t recall if the UV photo was taken when the glue was still wet, or after it dried.

But to answer your question, yes it glows brightly even after it dries.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View pottz's profile

pottz

17440 posts in 2097 days


#4 posted 06-27-2019 05:43 PM

another great tip my friend i too had not heard of this even though ive used tb2 for many years,ill have to look at getting some.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View Rich's profile

Rich

6919 posts in 1702 days


#5 posted 06-27-2019 07:18 PM


another great tip my friend i too had not heard of this even though ive used tb2 for many years,ill have to look at getting some.

- pottz

It has saved my butt many times. Residue from glue doesn’t have to be visible in ordinary light to mess up the finish, and with a cheap UV flashlight even the slightest traces show up with this glue.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View pottz's profile

pottz

17440 posts in 2097 days


#6 posted 06-27-2019 07:31 PM


another great tip my friend i too had not heard of this even though ive used tb2 for many years,ill have to look at getting some.

- pottz

It has saved my butt many times. Residue from glue doesn t have to be visible in ordinary light to mess up the finish, and with a cheap UV flashlight even the slightest traces show up with this glue.

- Rich


yeah many times i swore i had all the glue sanded out to be proven wrong by the finish,thanks.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View Desert_Woodworker's profile

Desert_Woodworker

6957 posts in 2327 days


#7 posted 05-11-2021 02:11 PM

+1 Thx good info and you can use the UV light to look for Scorpians at night…

-- Desert_Woodworker

View Ocelot's profile

Ocelot

3101 posts in 3751 days


#8 posted 05-11-2021 06:13 PM

Unless you are gluing black locust, which glows by itself.

-- I intended to be a woodworker, but turned into a tool and lumber collector.

View DevinT's profile

DevinT

1094 posts in 79 days


#9 posted 05-11-2021 08:44 PM

Ocelot, that’s what I was thinking … that some woods naturally fluoresce as that’s one mechanism how you would identify a species of wood.

-- Devin, SF, CA

View Rich's profile

Rich

6919 posts in 1702 days


#10 posted 05-11-2021 09:15 PM


Unless you are gluing black locust, which glows by itself.

- Ocelot


Ocelot, that s what I was thinking … that some woods naturally fluoresce as that s one mechanism how you would identify a species of wood.

- DevinT

In the first installment of this blog series, shipwright posted some of his marquetry with woods that fluoresce.

https://www.lumberjocks.com/RichTaylor/blog/118897

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View Desert_Woodworker's profile

Desert_Woodworker

6957 posts in 2327 days


#11 posted 05-11-2021 10:43 PM

+1 Rich I found that link very interesting…

-- Desert_Woodworker

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