Does it become hard once set? Wanting to use as a mother mold

It never sets - it remains soft and pliable. I would use hydrocal for the mother mold or reinforced fiberglass with epoxy.

Does this cure flexible or rigid?

This product does not cure at all. It remains pliable indefinitely

Does this putty maintain its shape once molded, like modeling clay, or does gravity cause it to melt back down?

Yes and it was very easy to work with. it did not stick to you hands and you could mold it very easy.

Wrap around outdoor speaker wire (binding post connection) for additional waterproofing? Want something removable for winter storage of speakers.

This is potentially messy for that application. Try using E/FUSING 112 to wrap wires to protect them from elements.

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E/FUSING 900 Moldable Silicone Putty

Product ID: 544645935

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Details

Brand
E/FUSING
Specific Uses For Product
Repair
Material
Silicone
Item Form
Putty
Special Feature
moldable and

📦Generous 265 oz package size

🛠️Moldable for precise leak sealing

🇺🇸Made in USA quality

Description

🛠️ Seal leaks like a pro—don’t let a drip slow you down!

MADE IN THE USA - Crafted with trusted domestic quality standards
HEAVY DUTY VOLUME - Large 265 oz supply for multiple repairs without running out
PERFECT LEAK PARTNER - Works seamlessly with E/Fusing 140 or 330 tapes for reinforced sealing
VERSATILE APPLICATION - Ideal for air, steam, and water pipe repairs—professional-grade reliability
PRECISION MOLDABLE SEALANT - Easily shapes to pinhole leaks for a custom fit

E/FUSING 900 Moldable Silicone Putty is a high-quality, USA-made silicone compound designed to mold easily into cracks and pinholes on pipes and hoses. Weighing 265 ounces, it provides ample material for multiple leak repairs and works best when combined with E/Fusing 140 or 330 tapes for reinforced sealing of air and steam leaks.

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