I bought some CrO from ChrisL for $4 and spent another $4 or so on a block of balsa from a hobby shop. When my str8s start to pull a bit, I give them 5 laps on the CrO and they're shave ready again. It's quick, inexpensive, and it works. Eventually, the CrO won't refresh the blade and I'll have to touch it up on my Chinese 12k.

By having the CrO balsa strop, I can keep my linen strop unpasted for daily use. BTW, my linen has the black streak.