Directly heated it will form a skin and that will slow down your dry time considerably. Best to heat the room around the prop to raise the over all temperature instead. Fans are good though. If you used a white glue based recipe and it gets direct heat it can form a pva skin and really slow down your dry time.
i used 2 water 1 glue with salt added
the heater is in the room, not pointed at it. but pointed at it, ya know what i mean? How do i know its dry? I mean what does it look like and roughly how long should 2 layers take to dry throughly. Also can I carve paper mache as is my intention. If so is 2 layers enough?
It will be stiff when dry. Two layers with fans should be dry later today. If mache is still drying it tends to be cool to the touch too. I would say if you plan to carve into mache at all with an exacto type knife best to do it after only a few layers of mache, you can always go back and add more layers to add strength, and seal over the cut edges.
I try to avoid food products in my props so I go with the white glue/water mix. I sometimes need different consistencies and rigidity, so I add more glue or water as needed. Never had a problem with mice eating the glue, though.