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Originally Posted by sunfish
How do you apply it ? Thanks
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Depends on the surface, when it is not too much surface, apply it by hand.
When you have a greater surface , you can prepare the chalk in big barrel, then put an immersion pump at the bottom of the barrel, then apply it with a hose that is connected to the pump,
applying with an immersion pump and a hose is the easiest way, gives great results. When the pressure is strong enough, you can stay at the ground without climbing up the greenhouse.
My advise, first test your system with normal water, is the immersion pump strong enough? You should mix the chalk very good with water, before you put it into the barrell.
Prepare it, mixing it with water, than pour it over the surface, the chalk will flow like water, it will soon dry and than you have your shadow.
The chalk stays at the surface it is flooding over,just be patient. Then have a look from the inside,you will realize the shadow, also spots that still give light.
Another advise, wear really old clothes, long-sleeved, use an eye-protection and gloves, after the application immediately take a shower, pure chalk is very agressive to the skin, its not burning or killing you, its just awkward.
Acording to your needs apply again and again.