Larry...
Q) "how does Esprit's pit filler weather"
A) Extremely well... Does not yellow or flake out... even on larger pits.
Q) "do you use the one resin in 10 degree weather?"
A) Well... it doesn't get that cold very often in the southeastern US.
BUT it is extremely thin... I have no problem using it on the rare occasion
that it gets down to the 20s
Here is the info from Esprit:
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"Esprit resins has a cP between 6 and 8*.
This very thin viscosity enables the resin to penetrate into the tightest legs of a starbreak, yet remain very flexible and extremely strong.
*Water = 1.002 cP
Olive Oil = 84 cP"
Esprits FAQ page
http://www.esprit-usa.com/faq_esprit.htm
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I would say it should flow well in the cold climates as well.
Q) Why is their resin more expensive, do they use better chemicals
A) Good question... I am afraid that I don't know enough about WSR resin
manufacturing to answer in a technical manner... Email Steve
info@esprit-usa.com
My personal reasons for paying the $$ they ask for it are as follows:
1) Best flowing resin I have ever used (reducing vac/pressure cycles)
2) Extremely reliable in many situations (even in slighlty contaminated chips)
3) Moisture tolerant
4) Remains flexible yet incredibly strong... it dos not fail, yellow or crack
5) Injectorless crack repair... <---very nice! And no need to pop a bulleye on cracks 6" or less!
6) Flows so well you rarely need to drill a hole...This leaves ultra clean reapirs. (no drill mark)
7) Will fill extended leg (1" or so) on a star from the impact point... quickly
8) Better...FASTER repairs with awsome clarity.
9) Easy, clean tool box. One resin for everything (except pit fill of course). Never waste time wondering which "CPS" resin to use OR trying to read the worn out labels.
10) Field bottle designed for use with a blunt syringe... this allows precise measurement and less wasted resin
11) Racetrack proven... If it holds up under the rigors and stress of racing it'll darn sure hold up on the street.
wew... I think that covers most of it. Yes it is the most expensive stuff on the market...
But even at their prices you still only spend pennies per repair. Plus your clients will think you are the best when you let them know that you only use top quality
imported resin!

My clients appreciate the fact that I spend 3x more on resin than the competition... They realize that I really do care about their safety and not just out to "make a fast buck".
Hope you find this reply helpful.