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