had one of these on one of my saph's about 3 years ago i ran my saph for 400 miles on a new engine took the head off to replace a valve re used the gasket and it was fine for 8000 miles until it melted and i was running greys, t34, 30 psi......

but if it was to happen to me now i would use a new one for the sake of 100 quid...