Old ass thread, again, BUT, I look at old threads for opinions all the time. People ask all the time how to frost up their plants. The skinny is this: if your grow room is set up properly and you have good genetics, you will get very frosty. If you add some more purplish light at the end, you will get maybe a little more frosty. If you add something like Snow Storm or Bud Factor X, you will get more frosty. Bud Factor X contains harpin protein which is created by a weak strain of E. coli (no shit) and its mode of frosting your plants is to activate the plant's immune system, if you will. When the plant's immune system is activated, it will create more trichomes. That make sense? As for Snow Storm I'm not exactly sure how it works but people tell me it does so I'll take it. I use an aerated reservoir so I don't think I can try it (breaks down in the oxygen pretty quickly), plus I use Bud Factor X and it is pretty freakin' awesome.