Nick in tyre - what to do?

Noticed this morning that my front tyre has a nick (probably from glass) in it. Its a Vittorio zapphiro tyre. The nick is 4mm long and about 2mm wide right in the middle of the tyre. Its done about 400miles.
Is it repairable? Or should I just buy a new tyre and play safe?
Thanks
Is it repairable? Or should I just buy a new tyre and play safe?
Thanks
.
"Let not the sands of time get in your lunch"
National Lampoon
"Let not the sands of time get in your lunch"
National Lampoon
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"Let not the sands of time get in your lunch"
National Lampoon
but yes - the superglue thing does work.
True, but so long as the P&£^$%^ fairy doesn't start to make regular visits, you may as well use these over the winter months & replace them when they are worn & the weather is drier.