Will Holts Fire Gum seal against Graphite gasket on exhaust?

So I'm ready to bolt my exhaust on to the cat but the old Graphite gasket seems welded on to the joint .......

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Will the Holts Fire Gum I have got to seal the joint work against this old graphite gasket or do I need to find some way to get it off?

Thanks
Stephen

I belive it will seal I think my escort gasket was a graphite and it did seal it

thats good, I am just worried as graphite is very slippy stuff

On the other hand I'm sure you could get that gasket off with a scraper etc.