Why Sentinel prime did not use his cosmic rust gun again ?

Cosmic Rust (disease), Teletraan I: The Transformers Wiki

ArtStation - Sentinel Prime Rust Cannon

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Wheeljack in Transformers: Rise of the Beasts is an IMPOSTOR

Sentinel Prime (1), This commissioned piece is for the same…

Did Dino Appear in Transformers: The Last Knight ?

Sentinel Prime vs Optimus Prime (AOE) - Battles - Comic Vine

Transformers Did you know ?

That's not a cannon, THIS is a cannon. Dark of the Moon Cannon

Bayverse Sentinel Prime, Wiki

Heavy/Scratch: - DIY Cosmic Rust Gun & Studio Series Sentinel

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RANDOM ACTION HOUR .:. Transformers: Cosmic Rust

YARN, The Transformers, Cosmic Rust top video clips, TV Episode

Check out this Awesome Custom! It's an Homage to the Cosmic Rust episode of the G1 cartoon! Credit and link to the full album in the comments! : r/transformers

Designs from Transformers Starscream's Brigade, and Cosmic Rust with Bill Forster and Jim Sorenson.