Hi
I have some serious imperfections in my mould which will need filled.

Using Gelcoat and wax works fine in small areas but I wondered if there was some other type of filler more suitable for larger surface imperfections - like a car body filler?

I would be using the mould to make a part to make another decent mould from (I know!!)

Thanks

You could use epoxy filler to repair the damage, than take a part and polish it (because the filler won't be polishable).