Well, Edward, if you are trying to glue simple frets (copper wire, coat hanger wire) on, then superglue (CA glue) is most widely used. If you are using standard frets with tangs then I would get some sort of fret saw. Stewart Macdonald and CBGitty (member here) sell fretwire. I use a Japanese Flush Cut saw from Harbor Freight to cut the slots.
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I have used super glue gel, less runny than the regular super glue. I get the glue from the dollar store 3 tubes for a buck.
Bob
-WY