adywan said:
Managed to get some more materials and started building the Asteroid trench but its just so damn hot here the plaster and other stuff is drying out way too quick. not a great start. lol.
How about using an air-humidifier? I have one that is quite effective, with a nozzle that I can point where I want the mist. I also think it helps a bit to soothe a sore throat, so maybe it could help against your hay-fever also. Maybe someone you know has one that you cold borrow for this project.
Plaster does not get hard by "drying". It cures hard in a chemical reaction, and (at least in my experience), the curing time is the same even if you mix it with a lot more or a lot less water than the prescribed ratio. After it has cured, the plaster needs to dry to become hard and be less brittle. You can not add plaster to dry plaster - the cured plaster needs to be wet for the uncured plaster to bond to it.