Flux z CN - jak funguje?

[Jaroslav Buchta]

Dnes mi kupodivu prisla zasilka, uz jich chybi asi jen 10...

https://www.ebay.com/itm/New-951-Free-cleaning-10ml-Soldering-Flux-Pen-for-Solar-Cell-FPC-PCB-CA/332288958732?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

At s tim klepu az mi skoro upadne ruka a mackam jak zbesilej, tece z 
toho jen cira tekutina, ani to nejak nesmrdi a vubec nelepi... Delam 
neco spatne nebo je to fake? Nebo to spis bude nejaky cistic?