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Banksy83 · 41-45, M
Line the gap with cling film making sure you use plenty.so its like a mould finish with plywood at the ends . Now mix enough plaster to fill the mould and pour in .it should set in 3 to 4 hours
https://youtu.be/BnB0dOzBWH0
https://youtu.be/BnB0dOzBWH0