Originally Posted by UnRider
I think it would make more sense to try it on your own head of hair. The inside of your arm is likely a lot more sensitive than a hair covered body part. If you are pressing too hard, you horse is likely to let you know, too.
I agree with your last bit, but I seriously doubt a horse's skin is as sensitive as our own.
Sensitive enough to feel a fly and bat it with a tail, yes, but grooming you know the difference by using it too softly and irritating them, or using it too hard and causing them discomfort.
My mare adores being metal currycombed, I had a stiff rubber one however she wasn't so keen on it. I use it to lift any dirt, dust and old hairs, and then to clean my brushes as I go along.