Pay attention to the air bubbles on the car vinyls when wrapping. Curved surfaces are particularly difficult to work with since they need a two-dimensional object to conform to a three-dimensional surface. If creases or bubbles appear as you work, gently peel back the vinyl and stretch it into position with heat (no more than 120°F (80°C) and strain. Work your way out from the center to the edges with the squeegee once again. The same issues apply when covering other objects such as mirrors, wheels, and interior panels. When it comes to fitting to curved surfaces, patience is required.
Sewing seams might be challenging, but there are some options. The simplest method is to simply overlap two vinyl sheets, which requires good alignment but no cutting. Cutting tape made of Kevlar is an effective way to make perfect seams without using a blade. Sharp knives should only be used as a last resort, with sharp edges to avoid snagging and care taken not to damage the underlying paint.