I think I understand correctly that SB and MP are used together. But zinc valerate is little more of a mystery. If using zinc valerate to preserve the smell at the stage you want, do you still follow up with SB and or MP?

For me, I only use Zinc Valerate when working with glands. I use SB and MP for all others. Some times together and sometimes separate. This depends on what type of meat, flesh, ect. I am working with.