First, although I get a nice, clean and sharp line when I snap, I also get a sort of cloud of chalk along both sides of the line. Also, when I'm pulling the line out, I get a major spray of chalk from the opening of the reel.
Although I realise this may not be the best group to approach for a sort of "rough carpentry" kind of question, I think there is a reservoir of experience and wisdom . . . well, blatant flattery sometimes works!
The reel is a Tajima, and works well in all respects: I really like the smooth action on the rewind. The chalk, if I recall correctly, is likely to be a Dewalt branded product. I realise that's rather vague, but I'm more than open to recommendations, even to the point of cleaning the existing stuff out of the reel as well as I can.