You are supposed to weed reflective immediately after cutting as the adhesive tends to bond back with itself (on the other side of the cut). I have used Oralite 5600 and really like it. A few tips: make sure your cut weight is heavy enough to scar the wax
paper, but not so heavy it cuts through the wax layer; be careful that the adhesive doesn't touch the unweeded part or weeded letters - a pain to separate again; Tape the reflective down before weeding so it doesn't move; make cuts between lines of text and weed one line at a time.
We do a fair number of firetrucks and I can say the 3M 680CR removable is awesome when you have to remove it. Costs a lot more, but great stuff. Nikkalite is the absolute worst to remove, even if it sticks to your table - 1/4" chips everywhere