Do you mean you lifted and tore some of the paint as you peeled back the tape?
If that is the case you left the tape on to long before removing, if your doing join lines in paint then you should use feather edge masking tape and you take it off at exactly the right time (the "exactly" is what makes a good pro painter)
The paint cannot be so dry that it tears (as I think yours did) but it cannot be so wet that it either runs or shrinks back after you remove the tape.
If it makes you feel better I've got it wrong a few times - I tend to take it off to early though
Try a practice piece or 2 and time it see what works - also depends on paint if your running a 2k with a fast hardener then flash time is 10 - 15 mins - out of a can it's is still quite quick mainly because the layers are so thin.
The only other thing that would cause that is poor prep or adhesion - if all the layers of paint lifted then the primer didn't grip - you get different primer for different surfaces, acid etch for ally, plastic primer, even "flex" primers and they do make a difference (don't use an etch primer on a helmet of course it may weaken it )
Hope that helps
God luck