It's not perfect, but it's the best we have.
I've never really had issues beyond user error. Make sure the surface is perfectly smooth. Try to pull it off the sheet without wrinkling it or allowing it to fold onto itself, use a moist toothpick to burnish, polish with soft cloth, use new sharp blade (scalpel blades if you can find them), paint tip of blade black (sharpie), and don't be afraid to remove, discard, and try again.
I have also found MM chrome enamel works very well for touch up - small areas you miss or areas that tear while burnishing or on seems you want to hide.