Fibreglass hemispheres...

If you want to go for 'authentic' 1960s-style Dalek hemispheres, you need to use fibreglass, laid up with the correct colour gelcoat, so that no painting is necessary. Here a mould has been prepared for making eight hemispheres at once. This mould was created by sinking eight four-inch balls into holes in a wooden frame, so that only the top half of them was exposed. A raised 'flange' ring was also added to make the finished hemis neater.r.

The whole frame was waxed and then this mould was created using fibreglass.
This mould is a direct 'negative' copy of the original wooden 'ball frame'.