50-4002
Solder paste/flux allows for proper solder flow and increased wetting of desired areas.

50-4002  Solder Paste
Similar to Kester SP-44, 2 oz container

An electronic quality rosin flux mix. This flux is not flammable, cannot spill and is non-corrosive. Type PF400.  Recommended for electrical or electronic soldering applications. 

Fluxes are intended to be used to reduce solder balling, and bridging.  The proper flux allows for proper solder flow and increased wetting of desired areas.  It has a Rosin base to name only a few of its features. This is the most popular paste flux available.