Rocker cover leak

Just changed camshaft cover seal on the disco td5 for second time because of leak at bulkhead end of cover restarted engine and seen very small amount of oil coming from same place and realised the edge of cam cover looks slightly grazed just need to know if there is a sealant I could use with the rubber seal or is it worth taking it to specialist to see if it can be skimmed as a new cover is about £200. Thanks for any help appreciated.

I'd have thought a bead of Hylomar blue would seal that up?

Thanks for info I will have a look at that