Longer esters usually call for less solvent, but I like to go with a standard 2% BA and 18% BB, the actual human grade approved BA content is only 0.9%, I've also used 1% BA and 10% BB, over 2% BA is just not needed. You can go up to 20% BB, the more BB the thinner your final solution. So if your wanting to pin with 23ga or smaller keep that in mind. 2/18 will pretty much hold anything you want, as long as your concentration is within reason.
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