I'm with Fontyyy, a thin smear of grease and they don't stick.
I've spent many hours removing dried out / welded on gasket material, when breaking down engines for the first time (since I had them).
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30