Ignition Control Module melting!

I have an Ignition Control Module that has been setting on the shelf in my garage. I went to move it and it was stuck to the shelf. There was an epoxy like residue that looked like it had ran out of the module onto the shelf. I saw this once before on a mounted part where the stuff had ran down the fender.
Any enlightenment here? I certainly don't want this happening on my restoration.
Thanks