...so what does flux do exactly? -sorry about the noob question, I am still learning-

Flux basically cleans the metal surface you are trying to make a solder bond to. Soldering effectively requires a "wetting" action, that actually creates a metal alloy at the bond. If there are oxides and dust on the contact surface you are soldering to (like a copper bit on a pcb), you will not create a metal alloy, and the bond could be scraped off with a razer blade. If you use flux correctly, you should not be able to easily scrap off the solder, since the solder and two components you are connecting that are metal, are now chemically bonded as an alloy.

What is the shelf life? Does this need to be kept refrigerated like some other solder pastes do?

This is from MG Chemicals Technical Data Sheet: Shelf life 2 years. Storage Temperature Limits 18 to 27 °C 65 to 80 °F Store at around room temperature and protect from direct heat or sunlight.

Is there a trick to get the plunger to remain in the syringe?

You just have to use it for a while. I had the same problem because the ring fits so poorly into the back, but once you use it to the point that the plunger is further in, it's much easier to use. I know, it's a terrible design flaw!

Is this appropriate to use for stained glass?

You could use it for stained glass, but since your solder would be covering a larger surface area, the flux with a brush would make more sense. This is designed for very small solders in tight areas, like electronics repair.

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8341-10ML 8341 No Clean Flux Paste, 10 milliliters Pneumatic Dispenser (Complete with Plunger & Dispensing Tip)

Product ID: 1778060

Details

Brand
MG Chemicals
Item Form
Paste
Material
Plastic
Special Feature
Pneumatic
Specific Uses For Product
Soldering and

🔥fast wetting & superior fluxing

⚙️10ml precision syringe dispenser

🛡️non-corrosive, moisture resistant residue

25369CFA

Duties & taxes included

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Description

🔥 Flux like a pro, solder like a boss!

NO CLEAN NO HASSLE - Residue is non-conductive and moisture resistant—skip the cleanup and keep your workflow smooth.
RAPID WETTING ACTION - Accelerates solder flow for flawless joints every time, saving you valuable project hours.
LEAD FREE LEADED COMPATIBLE - Versatile flux paste engineered for all solder types, future-proof your toolkit.
PRECISION DISPENSING ZERO WASTE - 10ml syringe with plunger & tip for exact application—no mess, no excess.
LONG SHELF LIFE READY WHEN YOU ARE - Stable formula stays effective for years—always reliable for your critical repairs.

MG Chemicals 8341 No Clean Flux Paste is a 10ml syringe dispenser designed for precision soldering touch-ups and repairs. Its superior fluxing ability ensures rapid wetting and excellent solder spread, compatible with both lead-free and leaded solder systems. The no-clean formula leaves non-corrosive, non-conductive, and moisture-resistant residues, eliminating the need for post-solder cleaning. Trusted by professionals for its long shelf life and reliable performance in surface mount assembly applications.

Specifications

ASIN	B00425FUW2
Best Sellers Rank	#4,517 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Soldering Flux
Brand	MG Chemicals
Brand Name	MG Chemicals
Color	Original Version
Container Type	Syringe Dispenser
Customer Reviews	4.7 out of 5 stars 6,102 Reviews
Global Trade Identification Number	00779008834107
Included Components	Plunger and dispensing tip
Item Form	Paste
Item Package Quantity	1
Item Type Name	No Clean Flux Paste
Item Weight	0.02 kg
Manufacturer	MG Chemicals
Material	Plastic
Material Type	Plastic
Model	8341-10ML
Number of Packs	1
Number of Pieces	1
Other Special Features of the Product	Pneumatic Dispenser
Part Number	8341-10ML-VP
Special Feature	Pneumatic Dispenser
Specific Uses For Product	Soldering touch-ups and repairs for surface mount assemblies
UPC	779008834107
Unit Count	1 Count
Volume	10 ml
Warranty Description	[email protected]

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