i have been flowering for three weeks now and want to know if its okay to spray guano on the bud? should i avoid that? will it make my bud taste different? thanks for the help

You should avoid spraying the buds as it can cause bud rot.
Try and just spray the leaves if you can, but generally it's best to avoid it, bud rot can ruin your whole crop.

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Crossart..... Mary's buds are like velcro and will hold onto anything your spray on them. I never foliar feed during flowering and recommend to others to avoid it also.
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To use guano properly read this thread - Making Tea - is EZ.... & Cheap !
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It's full of good info and easy to follow....
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Hope this helps....
Keep it Real....Organic..... cause chemicals are for cleaning your toilet.......
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thanx guys