Will this work to fix crack in aluminum transmission housing?

Probably not. It sealed some of the light cracks in my aluminum boat, but it did not work on the bigger ones(every time it cooled they cracked again).

Will this seal a hairline crack in a brass plumbing nipple?

I do not advise this due to the operating pressure. This is designed for low pressure applications like a refrigerator evaporator that operates approx 2 psi

Will this seal and hold freon pressure on a refrigerator aluminum chill plate (inside the frig)?

I didn't use this, my husband did & he said yes it will hold.

If you have a pinhole on the liquid side, and it is still under pressure, will this work? Or do we need to purge the system and/or have under vacuum?

Need to purge the system or not to work.

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🔥 Seal the Deal with LA-CO!

PRECISION BONDING - Perfect for quick fixes and durable repairs.
COMPACT CONVENIENT - Lightweight design for easy handling and storage.
TRUSTED BRAND QUALITY - Manufactured by LA-CO, a leader in adhesive solutions.
VERSATILE APPLICATIONS - Ideal for home, automotive, and industrial use.
UNMATCHED HEAT RESISTANCE - Withstands up to 350°F for extreme applications.

The LA-CO Heat-Seal Stik is a high-performance premixed epoxy sealer stick designed to provide exceptional bonding strength and heat resistance up to 350°F. Weighing only 0.28 g and measuring 11.68 x 1.52 x 1.02 cm, this compact adhesive is perfect for a variety of applications, making it a must-have for professionals and DIY enthusiasts alike.

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