We use a two part liquid epoxy which has a slight
exotherm, but goes no where near any tg of laminate
used. 

The material has been used almost 20 years by 
military houses with excellent results.  We pull a vacuum
to fill all holes when doing bare boards and to fill around
all components when doing failure analysis.  The resin
stick to laminate, solder mask and all metal involved.

Best way to check those which exotherm is to put a 
thermocouple in the mounts and cure under normal
conditions without samples in the mold.  The record
of temp rise will make those who question the exotherm 
feel a little better.  It's important to do this yourself since
most manufacuturers literature will state the exotherm
but it will most likely be for a block 3" X 4" which is a 
much larger volume than used in a mount.

Susan Mansilla
Robisan Laboratory
317-353-6249

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