Epson 4500 - Manual (Page 76)

Printing on Special Paper
Except for the paper thickness lever setting, you load multi-part paper
the same way as continuous paper. For details, see the section on
loading continuous paper in this chapter. Also see the sections on
setting the loading position and page length in Chapter 3.
CAUTION:
Multi-part forms should not be used with the
single-sheet feeding system or the optional cut sheet feeder.
Labels
If you need to print labels, always use labels mounted on a continuous
backing sheet with sprocket holes for use with a tractor. Do not try to
print labels as single sheets because labels on a shiny backing sheet
almost always slip a little.
2-28 Paper Handling