To make a joint or if you simply want to seal a crack or a hole plaster, this trick is made for you. When one is not accustomed to using it, plaster is not an easy material to implement.
To counter this inconvenience, here is the recipe of a small mixture to spoil a plaster particularly malleable, without any difficulty:
9 volumes of plaster for 1 volume of smoothing plaster.
This mixture will make your plaster softer and easier to smooth.Suggest a tip for this theme