This Kester Liquid Flux Pen is great for DIY solder projects.  This pen is a very convenient, clean way to dispense flux onto small soldering areas.

Specifications:

• Flux Type:Water Soluble
• Flux Applications:PCBs, Rework, General Maintenance & Repair
• Dispensing Method:Pen Applicator
• For Use With:Lead-bearing & lead-free alloys

Datasheet is available for viewing here.