Slight difference in paint colour

[Beachball]

Yes,I would imagine they do come in bulk,in primer ready for spraying.

Anyway....today I gave the car a good shampoo with Turtle Wax and a dry with microfibre towel...it was filthy.
Standing back afterwards,I must say the bumper does'nt look quite so bad.
The body paintwork is now gleaming which makes the bumper look a little better.
Im happy with that and will give the body a good polish soon with Autoglym which may help even more.

Thank you all once again for your very informative replies.

[Lord Voltermore]

Glad to hear it.  The pearlescent white does tend to conceal a uniform layer of dirt   unless it shows as obvious mud  splashes etc.  I often think mine doesnt need a wash, until I start washing it.

Like me. I have a shower once a month whether I need it or not. 

[Beachball]