V3 is a fake. No such thing as a v3. It's not genuine  inventec amtech. Alex went over this 

V3 is a fake flux introduced by amtechdirect after they lost there relationship with inventec. Here's a letter we received from invetec to clear any misinformation. Check attachment. V3 is not from Inventec and non genuine flux. Original amtech flux is only sold thru us at NorthridgeFix.com and other qualified distributers. It is not sold on Ebay, Amazon, Aliexpress, amtechdirect or anywhere else. Check list of distributers at https://www.inventecusa.com/reps---distributors.html. You can purchase Genuine Amtech flux directly from us and you have the option between buying individual or wholesale. Prices are listed. click on the link https://northridgefix.com/product/amtech-nc-559-v2-tf-flux-10ml-syringe-plunger-2-needle-sizes/

See attached Letter. 

Thank you for this update, i'm glad to know this I was about to shop for V3.