[header] How to add custom decals to a car [title] Identify a location on the car for the decal. [step] Before applying a decal, you must determine the location on the car you want to place it. This is particularly important for large decals that may extend onto multiple body components, as you will need to plan for applications that extend over gaps. 
[substeps] Assess the area you want the decal to be placed and determine if it will fit there. [title] Place the decal on the vehicle to measure.