thanks mick and chris
problem is i am well over18 stone (over 255 lbs) so it has to be robust any way i have wire brushed it its not as bad as i thought looks bad but a strip of steel all the round the outside should set it up ok if not i shall hunt for a better seat pan
i had thought of making a fibre glass one but its only the front quarter i think the foam must have got wet at some time and thats where the rust started worst part of the strip was getting the old glue off what some one had stuck the cover down with but petrol sorted that
merv thanks for the advice and encouragement