I bought my Olfa 45mm rotary cutter about 4 months ago, but right from the beginning it was a bit blunt. I'm still not sure it's my method but I feel like I have to use quite a bit of force or go over the same area 2 or 3 times before I can get a cut without any thread pulling. I thought I might have just bought a dud blade so I replaced it with a generic blade but that was even worse! It felt fine for the 3 or 4 cuts but after that it was blunt as well.
Anyway I was just wondering if it's likely to just be my method (I cut kneeling down mostly) or if it's possible it's my rotary mat? I bought the cheapest/largest one I could afford and it didn't specify whether it was self-healing but I'm thinking it's not. Could the mat be blunting my blades as soon as I use them?