...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 action

🧴10ml precision syringe dispenser

♻️RoHS compliant & no-clean residue

¥5978

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Description

🛠️ Flux like a pro, finish like a boss!

NO CLEAN NO HASSLE - Non-corrosive, non-conductive residues mean no post-solder cleaning required—save time and effort.
UNIVERSAL COMPATIBILITY - Works seamlessly with both lead-free and traditional Sn/Pb solder systems for versatile use.
ECO CONSCIOUS COMPLIANT - RoHS certified formula aligns with modern sustainability and safety standards.
FAST FLAWLESS SOLDERING - Superior fluxing ability accelerates wetting and spreads evenly for professional-grade joints.
PRECISION DISPENSING ZERO WASTE - Syringe design with plunger and tip ensures exact application for flawless touch-ups.

MG Chemicals 8341 No Clean Flux Paste in a 10ml pneumatic syringe dispenser delivers superior fluxing performance with fast wetting action. Its no-clean, non-corrosive, and non-conductive residue eliminates the need for cleaning after soldering. Compatible with both lead-free and leaded solder systems, this RoHS compliant flux paste is ideal for precise touch-ups and repairs on surface mount assemblies, making it a top choice for professionals seeking efficiency and reliability.

Specifications

ASIN	B00425FUW2
ASIN	B00425FUW2
Best Sellers Rank	#5,280 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Soldering Flux
Brand Name	MG Chemicals
Color	Original Version
Container Type	Syringe Dispenser
Customer Reviews	4.7 4.7 out of 5 stars (6,075)
Date First Available	September 6, 2010
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
Item model number	8341-10ML
Language	English
Manufacturer	MG Chemicals
Manufacturer	MG Chemicals
Material Type	Plastic
Model	8341-10ML
Number of Pieces	1
Other Special Features of the Product	Pneumatic Dispenser
Part Number	8341-10ML-VP
Product Dimensions	0.47 x 0.47 x 0.16 inches; 0.71 ounces
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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¥5978

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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