For those of you who have trouble threading the loopers - go to any drug store and purchase "floss threaders" in the dental section. They look like blue loops with a tail. They are used for cleaning permanent bridges (teeth).
If you work with decorative threads then a "double eye needle" is super for hiding the thread tails.
If you like to use ribbon floss or thread that feeds off better horizontally - then a horizontal spool feeder will become your best friend!
Seam Sealant - there are many brands and I have used them all. I have no preference because they all work pretty much the same. Though if you ask around I am sure people will tell you their favorites.
Small very sharp pointy scissors. If you ever get a knot of thread wrapped around the needle plate you will be glad you have them. Been there - rough road!
Clear nylon thread for fixing ooooopps.
Next time I am going to go over some "mishap" terms like stacking etc. and give you some tips on how to get beyond the misery.
Til them - enjoy your serger and stitch away!