I had a couple of chips in my tank so i sanded the area around the chip to bare metal before painting to stop any rust spreading under the paint. Touch up paint was about £5 from halfords.
i will nip down to my local paint supply's see if they can do me a colour match. is there anything you can buy other then a tank bag to stop scratches on top of the tank?
Black is easily matched. Buy one of those Pen thingies in Halfords. I have the same tiny chip on my Black Bandit for nearly 10 years and never got around to sorting it yet! It hasn't rusted because like your chip, there is still a (white) coating protecting the tank. If it was gone into bare metal I would have sorted it on the spot. Is it my imagination or is your paint job very rough looking??
As for protection against scratches....is it around the area were your belly might touch the tank??? If so, you can get a tank pad like below in different colors.
Also, the Bandit have a tank bra that covers half the tank from the bottom to the fuel tap which is very handy. Dunno if they can be got for the Fazer, though. The other alternative (and expensive) is a Bagalux Tank cover. You are talking about £112 here, but it is a lifetime product IMO. It's the ultimate product for protection IMO even if you have no intentions of using a tank bag. See photo also below.....