you may want to look in to what else pacer offers, on the industrial side. in my electronics manufacturing days a few years back we used rx-gel ritualisticly. this stuff holds with easily 10 pounds or more force depending on the application. its hard stuff once its dry.
http://www.pacertech.com/other.htm
there was an accelerant that we used with it, but it oxidizes what ever it touches fast, so i wouldnt use it.
mind you, it was very easy to work with. its a thick gel but small amounts are all thats needed.