Plastic cement works by "welding" two parts together. It'll slightly melt the plastic and join the two (just like real welding). So it definitely won't work on metal photo-etch parts or resin, because it is designed to weld plastics.
To attach PE parts try using either CA (super) glue, an epoxy or a white glue (even wood glue will work). For a strong join, I use CA. But if I will have to move the part around, to get it in position, I'll use white glue.
hope this helps.