I have used a bunch of different products over the years from spray can stuff to schutz applied with a gun to sprayable seam sealer. Mostly having to restore oem appearance on collision repair jobs. All of it can be tricky to apply and get a nice uniform pattern/texture. Not all are clear and if your painting over it, it doesn't afford much chip protection anyway. I'd rather deal with a rock chip then a ***** mark where a rock tore a chunk of chip guard off and leaves you dealing with a deep hole the size of dime. My 2 nickels, but you didn't say what products you were looking at or what you're trying to accomplish????