Originally Posted by
DiZzYNaTiOn
Yea the razor has never really worked good for me. I can never get it deep enough, and if I try I end up scratching the body or worst, cutting myself
You really aren't supposed to do it in one pass anyway. Nice, easy and smooth the first time or 2. This is just to mark the lines for your next couple of passes with the knife. Then a little pressure to make the final couple cuts.
That's why I use a semi dull blade on my first 2 passes. Then switch to brand new blade after the lines are scored into the polycarb.