Will this work to close jump rings?

Yes, it will solder close jump rings

Buying for school. need to solder solitaire rings because normal solder isn't working the best. good enough?

For the life of me can't understand why anyone would answer, in some form, "I don't know". How the paste works with the solder used needs to be tested. I did. Wife makes 3D dream catchers using 4mm dia wire rings, in various diameters 6"-18" (all are coated) from craft stores. Rosin (or flux) core solder work ok but I've found this SOLDER-IT SILVER BEARING SOLDER PASTE used with solid LEAD FREE SILVER BEARING solder holds the best using a butane torch. Key is, one must heat what's being soldered after the paste is used and before the solder is applied. Temperature is everything. If the base material can be heated with a soldering iron by all means use it as the solder flows and bonds towards the base material.

what type of metal is left behind?, silver?

I only used a small amount when I created a amethyst and sterling dragonfly for a client, still have quite abit of the soldering silver left. I used a low heat soldering iron (silver melts at a fairly low temperature)

Could I use this on gold costume jewelry jump rings or will the silver look too obvious? I am at a loss as to what to use for the jump rings.

You could use it on the gold costume jewelry, however, it would be obvious it is not gold. You would better using Solder Paste With Flux Yellow Gold 14k 1 Dwt.

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Solder-It SP-7 Silver Solder Paste 7.1 Grams | Soldering Flux Paste for Electronic Components, Home Improvement, and Wiring | Silver Solder for Jewelry Making and Repair | Lead-Free Solder Flux

Solder-It SP-7 Silver Solder Paste 7.1 Grams | Soldering Flux Paste for Electronic Components, Home Improvement, and Wiring | Silver Solder for Jewelry Making and Repair | Lead-Free Solder Flux

Product ID: 6940739

Details

Brand
Solder-It
Item Weight
0.04 Pounds
Item dimensions L x W x H
6.4 x 1.8 x
Material
Silver
Number of Packs
1

⚡High electrical conductivity

💪10,000-25,000 PSI tensile strength

🛡️Corrosion-resistant finish

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Description

⚡ Power your projects with silver-strong precision!

ECO SAFE LEAD FREE - Non-toxic, heavy metal-free for safer, cleaner projects
UNMATCHED DURABILITY - 5x stronger than standard solder with extreme tensile strength
INSTANT SET ZERO FAILURES - Prevents joint movement issues with rapid setting formula
SUPERIOR ELECTRICAL PERFORMANCE - Ensures optimal conductivity for sensitive electronics
EFFORTLESS PRECISION APPLICATION - No-mess syringe design for flawless DIY soldering

Solder-It SP-7 Silver Solder Paste is a 7.1-gram, lead-free flux paste designed for electronics, jewelry, and metalwork. Featuring a no-mess syringe for easy application, it delivers high electrical conductivity and corrosion resistance. With tensile strength up to 25,000 PSI and instant setting properties, it ensures durable, reliable joints while being safe and eco-friendly.

Specifications

ASIN	B000OVI0IY
Best Sellers Rank	#16,789 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Soldering Flux
Brand Name	Solder-It
Compatible Material	Metal
Customer Reviews	4.2 4.2 out of 5 stars (753)
Item Dimensions	6.4 x 1.8 x 0.5 inches
Item Weight	0.04 Pounds
Manufacturer	Solder-It
Material Type	Silver
Model	MSW-IS-SP-7
Number of Items	1
Part Number	SP-7
UPC	384920590606

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€ 31.52

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In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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TrustScore 4.5 | 7,300+ reviews

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