Re. heat and colors.

I am planning on using a toughened two phase epoxy for my parts instead of
the single phase relatively low temp epoxy with a much higher heat distortion
temperature.  There are no properties which are not superior to the Jeffco.  
It's not that the 1307 is necissarily bad, just that there are a lot of  
resin systems out there far superior.  You basically get a higher safety
margin, more flex cycles, better bonds, less temperature sensitivity, etc.  

Dan Newland