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At one point, I complained that 0.25micron diamond spray on felt was harsh also. Now, I don't believe that to be true. I learned the characteristics of the surface and the abrasive. That is all.
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The common wisdom seems to be pretty harsh toward pastes and balsa. I can't agree. You can misuse diamond on felt, or chromium on linen, or plain leather, or almost anything.

I use chromium oxide on balsa, and also iron oxide on balsa. I also use diamond on felt. I don't think you have to choose one or the other, but I believe they are somewhat complementary surfaces.