Using K-L-N & Pro-tekt

[Pinkcat]

Hello everyone
I have some KLN and protekt I would like to use, but am a little confused.
Some say that you shouldn't use KLN during blooming season because it will cause bud blast or stalling of spikes? Is that true? When should I use it and is it OK to mix with the fertilizer?
Do I mix the protekt in after the fertilizer? (it says something like that on the bottle) How often should I use it?
Thanks for all advice!