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Diamond spray can be applied to either (felt, balsa, canvas,
denim on a plank, leather, leather on a plank, mouse pad).
The same is true for CrOx as well.

Balsa or hardwood is less flexible...

Recall that you cannot get it off. To begin a light spray each use or
every other use. Then when it is "loaded" it is good for months. To load
it may take one, two, three light applications....