I got four syringes in the kit, three have 18 G needles. On my first attempt, I tried to draw 50/50 PG/VG through and failed. I think I need a larger gauge needle or the syringe with a tube for that. Or maybe a second attempt will succeed.
Ya VG is as thick as syrup. The blunt needles HG offers do suck it up though. Theyre very large guage (not sure what the actual guage # is) but the ends of them are large enough diameter that you can pretty much fit the tip of a ballpoint pen into them.
About the air bubble in the syringe. Usually the air bubble dose not span the entire diameter inside the syringe (if you spin the syringe around and examine it you'll usually see that it only spans half the diameter or so, which makes it really hard to compensate for it).
What you should do is suckup air into the syringe, stick the needle deep into the solution your trying to suckup, press down the plunger all the way to inject out the air, and you've now created a vaccum. Make sure you dont pull the syringe out of the solution. Now suckup a bit of the solution, and then instantly inject it back out into the solution (again, your needle still should not of been removed from being submerged in the solution). Now suckup the amount of solution you want to measure. IF you notice any air bubble forming inside, inject the solution back into the bottle and re-draw again. If for some reason you keep getting significant air bubbles in the syringe, your plunger may not be fitting the syringe properly (manufacturer defect) or there may be an air leak somewhere in the syringe-needle connection point (manufacturer defect). Try using a different syringe if this is problematic. Also try to pull/press the plunger STRAIGHT (when pulling it back try not to bend the plunger as your pulling as this can create a microscopic air gap and cause a bubble to form).
As to adding drops into the back end of the syringe to measure and the volume of liquid the needle/syringe draw-point holds... im not sure but I ASSUME syringe manufacturers compensate for the volume of solution that is held in the needle shaft and/or syringe draw-point. Meaning the first markings are slightly different to compensate for this volume thats held there. I dont think this is a huge problem for measuring your flavor drops. The amount of solution the needles hold is usually negligible. But ultimately, I dont see anyway to really work around it.
In my personal experience, it hasnt made any noticeable difference in my final products flavoring. Im not sure if theres a better way to calculate the ml quantity of flavoring per drop.
One thing I will say, even using the same brand of flavors, there are differences in the volume of each drop from the same dropper between flavors. Some flavors are thicker and others are thinner, so you can expect the exact volume of each drop to be slightly different between the two flavors, even if theyre the same brand of flavorings. So to be truly precise, you'll want to measure the "drops per ml" calculation for EACH specific flavoring your using, not just for each brand of flavoring (dans calculator gives general "drops per ml" for BRANDS of flavorings but this doesnt apply to all of the flavorings that brand offers).
Example; LorAnn's bubblegum flavoring is very watery, whereas LorAnn's coffee flavoring is very thick. It seems to me that the thicker a flavoring is, the larger volume each droplet is.
Anyways, goodluck with your ventures bud! Im still a DIY amateur myself, but learning more everyday. Am still frustrated with the fact that I cant find any BRAND whose all flavors work good for vaping, I find 4 out of every 5 flavorings I try, simply SUCK for vaping (meaning even at say 30% flavoring, you cant taste them worth a ....

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