Its been about 18 hours and there is no yeast activity. I followed all directions. Fermentation is at 70 degrees. What should I do? Wait longer? Pitch more yeast?
By no activity, what do you mean? No bubbling, krausen? The bubbling is not a good indication of fermentation. Give it a couple of days and I'm sure you will get fermentation occurring. RDWHAHB.
Remember the only way to judge fermentation activity is with a hydrometer NOT by airlock activity, I've posted the reasons why a billion times around here, so you can probably find it...And it does take up to 72 hours to kick in...
As long as you didn't dump your yeast into boiling water and kill them, you should be fine.