Funny I saw this as I was going to the old thread where we spoke of this to see what ratio I mixed it at LOL because I'm getting ready to spray right now, I spray every weekend, this crop would have been gonners without it!
as far as I can ascertain it's safe to spray on Tobacco right up to the day you pick and smoke it, and it doesn't mention Bud washing anywhere on the literature that I could find
So it's copper, and from what I understand it works on the plant, not in it systemically, and I do wash my bud! there are some good articles on bud washing here if you're still reluctant
Frankly my concern is smoking the copper product and not the few trichomes that maybe knocked off Bud washing, I would expect a rainstorm to knock off a few more trichomes than a gentle Bud wash, good luck
Edit: by the way what the hell was the ratio we used?? I mix a gallon and I'm just finishing it up, and I can't remember if it was one tablespoon or two per gallon? LOL
Found it:
"I hear you dude. unfortunately I've been spraying plants forever so I've got that aspect of it down LOL, but I was unsure of the ratio, tomatoes says 2 ounces per gallon, but I mixed it at 1oz/gal initially because I burn sulfur 2×week too, if it doesn't work at this ratio I'll up it, thanks"