I have found that it is definitely my cutting mat and not the blades
Originally Posted by
barnbum
I bought many new rotary blades on ebay years ago--still using them up. When I put a new one in, it cuts like a hot knife through butter, but within 5-10 cuts, it feels dull already. Am I missing something? Could it be my mat? It's several years old, but still fine. I want more butter cutting!