Most uncoverd humbuckers are bare coils, with tape around the wires. Can i do the same with singlecoils?
Yes. It makes no real difference AFAIK.

I had the pup covers off of my Strat for ages. I didn't tape the wire or wrap ribbon around it. It'll be fine, but it's kinda pointless.

How do you say "I'm okay" to an answering machine?