I like this idea more than using water soluble pen. You can remove it easily, and you dont have to wash the finished craft.
The only question I have is if the grid tangles up with the floss. Because if happens, it could be difficult to remove the grid.
Thanks for the idea!
I don´t grid my work .... when is big projects .... I make a cross in the middle of the fabric ... to show the exactly center only.
If you need wash ... use warm mneral water ... and transparent kitchen detergent ... here we have one with aloe vera ... is very soft and light ... and don´t have acid ph ... and let dry at the shadow not directly at the sun ... and if possible with the wrong side up.
I have used fishing line, not thread to grid my projects. The same type of nylon line that fishermen use on their fishing poles. It slides out very easily when I am removing it and it doesnt get piercecd by my needle when I am stitching so the threads do not get tangled.