Gypsum tape for mould support
Gypsum tape is an inexpensive and practical aid in mould making.
It can be used as a support for thin-walled silicone moulds.
It is also suitable for a temporary and fast "fence" if the shiny surface and the precise size are not a requirement.
For example, replacing the missing part of car seats with flexible polyurethane is the fastest way to shape the border.