How to make portland based (exterior) stucco from scratch in a wheelbarrow.
by Volume:
1 part portland
1/2 part lime
4 parts damp washed plaster sand.
By weight:
25 Lbs portland
6 Lbs Lime
120 Lbs damp/wet plaster sand
20 Lbs of clean fresh water
If the sand is dry you will need around 25Lbs of water