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

Would a normal car body flexible type 'styrene' filler work - like a Upol 38 which is a two part filler but inexpensive and easy to sand?

Or would this react with the new gel coat and give me the same problems of wrinkling?