Perfect thanks for the info Waiting on many many flavors to get here then going to start working on many of your tasty sounding recipes. Could you tell me do your recipes work good mixing by weight or is it better to use the old school non scale method? Do you personally do it by weight if so what scale do you use?
You should use whatever method makes sense to you! Either can work if you do it right.
If you use weight, you have to account for differing density of ingredients, so you need a calculator with those built in or that allows you to input that info. Somewhere lately on VU I saw a list of densities for FA flavorings. If you don't account for differing densities, your results are not the same as if you measured by volume. Usually not a huge difference, but could be enough to make a big difference in some recipes. If you account for density properly, the results are the same as measuring by volume.
For me, that's all needlessly complicated. For my usual small batches, I use droppers that produce 33 drops/ml. 1 drop in 6ml base = 0.5%, or 1 drop in 12ml base = 0.25%, etc. No scale, no calculator, very simple and accurate.
For larger bottles of flavorings-only, I do this: http://vapingunderground.com/threads/how-to-mix-small-batches-of-complex-recipes.1980/ . Where I see "%" in a recipe, that's "tenths-of-ml" of flavoring. Instead of a bottle of juice with 8% flavoring, I end up with 8ml of custom flavoring. No math, no calculator, easy for me, yet exceptionally accurate.