I have a pair also. I believe Andy said it was plain old Elmer's white wood glue.
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Listened to the Fosgate last night with the Top Hats installed. There was an improvement in the quietness of the background. Music came from a more black background. It was quieter, allowing me to hear deeper into the music. This was not a night-and-day difference with vs. without the top hats, but I do like what they are doing. I'm going to search the internet to see if I can buy another pair from someone, as the instruction manual makes a comment about the effect being cumulative. Thanks again for helping me identify what glue I needed to use.
Happy New Year!