I really doubt you will get over 400 drops of resin out of a 1/2 ounce bottle. this is where jeff would say right, you only get this many. and I will not be testing my bottle for you, this is a good question and can be awnsered, but by who.
and really if you got 2o repairs done out of the 1/2 ounce bottle and it cost you 40 bucks it would really cost you 2 dollars per repair. and if you got 40 out of it it would be a buck per repair, still cheap in my book.

please mr. wizard tell us how many drops are in a 1/2 oz bottle of resin.

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