I had my upstairs re-plastered but unfortunately builder created an uneven shadow gap at the botton of the wall with beeding that' also too large.
I'd like to tried to use 3mm ply stripa to create an even gap and fill the remaining gap with bonding plaster but the plaster adhered to the ply, so it didnt work. What material can i use instead of ply that's easily available?
I'd like to tried to use 3mm ply stripa to create an even gap and fill the remaining gap with bonding plaster but the plaster adhered to the ply, so it didnt work. What material can i use instead of ply that's easily available?

