Coiler666,

I would imagine that the term "Derlin" that the shop was using was a corruption of the word "Delrin".

Delrin is the trademarked name of one of DuPont's products and is another of the cyanoacrylates. All of them are similar but have specifically different characteristics to fit them to different uses (i.e. more resistant to wear, or easier to work, or more resistant to solvents, etc.)

Bob