OK. All of us have experienced some flaws in matboard, but some of the reactions in this thread seem extreme. A few thoughts at this point:
1. The problem is universal -- every matboard type and brand occasionally has a flawed board. This issue is not unique to Crescent Select, as implied by the original post.
2. It is unreasonable to expect a paper product to be consistently flawless, just as it would be unreasonable to expect a length of moulding to have no warps or knots. Flawless matboards have never been available, and never will be.
3. A matboard flaw should rarely cause us inconvenience or added cost. Rather than inspecting after we cut, why not look closely at the whole board before we cut it? That way we could almost eliminate the risk of wasting our time to cut it again.
4. It may be tempting to throw away flawed mats we have cut, but if we require our suppliers to replace flawed boards, they may be inspired to more carefully inspect them, and keep even more flawed boards out of our supply chain.
5. I've only been framing for 19 years, but in my limited experience, a flawed matboard is rare. I have not kept track because it's no big deal, but my guess is probably less than 2 out of 100 boards have surface-visible flaws. And some of those are fixable. If we cut 25 double mats per week, a defect rate of 2% would affect about one board every two weeks. For me, it seems more like one per month.
6. If your incidence of matboard flaws is more than 2%, perhaps the problem is damage from handling, or damage in the shop, not flaws in the board. Is it possible that the flaws are created in your handling & cutting? For example, it takes only a spot of pencil lead, embedded in the surface, to make a permanent mark that could look like a flaw. Also, a tiny bit of 'sawdust' from cutting aluminum moulding, or a flake of some moulding's gesso finish, could become embedded by the matcutter's clamping bar, which exerts considerable pressure.