Primers all come in spray cans, be careful when spraying them as the tip of your finger can sometimes go over the edge of the nozzil and interfear with the spray. All my primeras and tints are very quickdrying, about a minuet per a coat with a heat gun. Not sure what halfords primers ect are like with drying times.
Also I matched my paint exsactly with my spectrometer, and applyed it with my own compressor and spray gun. As my paints metallic it needs to come out of the nossel of my gun with pressure otherwise it wont sit correctly on the surface of the area being sprayed.
If your redoing your whole bumper like I did, I would if I was you get a professonal to do it as if you dont overlap each pass with the spray gun or can by 50% each time and blend out the new paint with old its going to look patchy and sub standard.
Hope it goes well for you thought bud if you do decide to do it. Any problems give me a pm