I second Ketatex Hoof Hardener. It won’t rub off, it soaks in, so it will be fine in your situation.
Have you talked to your farrier about your concerns? He should be able to fix it if he kmows what he is doing.
On the other hand… could be the farrier’s fault too. Though I wouldn’t want to automatically jump to this conclusion. Are you in a boarding situation? If so how are the other horses’ feet?
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