On 2/16/2010 12:38 AM, Don Foreman wrote:
Doesn't stress elex by shrinking because it doesn't
cure brittle-hard like epoxy, it retains a bit of give.

Don has brought up something the OP may not be considering. If one whips
up one's own witch's brew of a potting compound, the desired
electrical/mechanical characteristics may not be there. As an example,
the device the OP posted bears a superficial resemblance to a
microphone. If you were trying to pot the high impedance buffer of a
capacitor microphone, the results may be disappointing. A board is
generally pretty difficult to unpot.

Kevin Gallimore