If you can find a fresh bottle of Extend, it has some purpose in situations where you need more time to setup for a glue up operation. The problem is, every bottle I've seen on a store shelf is past it's shelf life, and it way too sticky/gooey to use without thinning it.
I also use LMI white for most of my guitar stuff. I think the main advantage is the clear (as opposed to slightly yellow) glue lines. I've used it enough that I like the feel of it (I'm used to it), but I would have no problem building a guitar with 100% Titebond Original.
I have a couple of not-so-fresh bottles of regular titebond laying around that I use when making molds and such.
The one issue with LMI white is that it only comes in 8oz bottles and it has a relatively short shelf life compared to Titebond and other wood glues. It keeps longer if you keep it refrigerated, but I have yet to get to the bottom of a bottle without having to toss it. You have to keep an eye (nose) on the LMI glue. If it starts to smell sour, toss it (or save it for non-guitar related things).
Titebond also has a 'best before' date. You have to decode the stamp on the side of the bottle.
Here is how you decode the new stamps (if you have an older format, toss your glue)
The first digit represents A for America (made in), the second digit is the last digit of the year of manufacture, the third and fourth digits
represent the month, the fifth and sixth digits represent the day of the month and the last four digits represent the lot number.
The bottle I'm holding in my hand has a code "
A108080090". This bottle was manufactured in
America on Aug(
08)
08, 201
1 and has a lot# of
0090
According to Franklin, Titebond has a shelf life of 12 months.
http://www.titebond.com/product.aspx?id ... 84acc71207
I've taken to buying the 4oz bottles so it stays fresh. I wish LMI would sell their white glue in 4oz bottles. :)
Tech info from the Titebond website
titebond.com wrote:PHYSICAL PROPERTIES
Type: Aliphatic resin emulsion
Calculated VOC: 10.7 g/L
State: Liquid
Weight/gallon: 9.2 lbs.
Color: Yellow
Chalk temperature: * Approximately 50°F.
Dried Film: Translucent
Flashpoint: > 200°F.Solids : 46%Freeze/thaw stability :
StableViscosity: 3,200 cpspH : 4.0
Storage life: 12 months in tightly closed containers at 75°F
APPLICATION GUIDELINES
Application Temperature:: Above 50°F.
Open assembly time: 5 minutes (70°F./50%RH)
Total assembly time: 10-15 minutes (70°F./50%RH)
Minimum required spread: Approximately 6 mils or 250 square feet per gallon
Required clamping pressure: 100-150 psi for softwoods, 125-175 psi for medium woods, and 175-250 psi for hardwoods
Method of Application: Plastic bottles for fine applications; glue may also be spread with a roller spreader or brush.
Cleanup: Damp cloth while glue is wet. Scrape off and sand dried excess