Is it that bad? Scratches add character and a look of purpose.....
Otherwise, if it's a GRP tank, araldite will do the trick. If the gel coat has lifted you will need to grind back to the glass fibre backing to make sure any cracks don't continue to open under stress. After that, the araldite can be applied and then sanded smooth after it's cured. Car accessory shops sometimes sell gel coat repair, which would be better, particularly because colour can be added as it's mixed. It usually comes in large-ish quantities though.
If the tank is polythene it's more of a problem. Hot melt glue sometimes makes good semi temporary repairs for leaks, but if it's only cosmetic I wouldn't bother.
Stig
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Tall men see everyone else's bald patch but their own.......
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