Can this be used to replace a convertible top rear glass?

Looked at the ribbon and it do not appear to be what I needed. I used the material in the tube about 1 year ago to replace rear window in Miata. Still appears to be holding fine Application went well but took two people.One to hold glass, one to apply goop. Cautions - it is VERY sticky - wear rubber gloves. I was not too successful in smoothing it out after applying it. Use care and it will look ok. You may do some experimenting first and look at some you tube video. I used the recommended primer on the glass

how can this be both round and 1/8 x 1/4"?

Difficult question to answer...I just looked at mine and it appears to be apprxly 1/4 inch "round" x 30 feet to start, but it is squished in many spots that appear to be apprxly 1/8 inch in depth and no longer "round"; it could be squished more or less depending on what you need. Not sure this will help, but maybe!

How thick is it? I need a 1/4 to 3/8 inch thick by at least 1/2 wide and at least 20 feet long.

1/4" round, it gets wider if you press it flat. It is clearly labeled 1/4" by 15 feet . . so NOT 20 feet long.

Would this work on a 2007 Saturn Ion?

Thank you for your question. We suggest using the same type of adhesive your vehicle manufacture uses to install a windshield or a suggested adhesive from the manufacture. In this case, your vehicle should use a urethane adhesive such as 3M 08609 Window-Weld Super Fast Urethane Black Cartridge. Feel free to contact us at 877-666-2277 option 2 if you have any questions. https://www.amazon.com/3M-08609-Window-Weld-Urethane-Cartridge/dp/B000FW61EW/ref=sr_1_1?keywords=B000FW61EW&qid=1565357516&s=gateway&sr=8-1

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🛡️ Seal your ride like a pro—because your windshield deserves the best!

ALL IN ONE KIT - Includes setting blocks for precise alignment, making your repair job faster and more reliable.
TRUSTED 3 M QUALITY - Engineered by 3M, a leader in automotive solutions, ensuring long-lasting performance and peace of mind.
PRECISION THICKNESS - 1/4 inch diameter ribbon delivers the perfect balance of durability and flexibility for a professional finish.
SEAMLESS FULL COVERAGE - 15 feet of premium sealer ensures one complete windshield or backlite replacement without compromise.
EFFORTLESS INSTALLATION - Controlled compressability means no mess, no squeeze-out, and no light leaks—just a perfect seal every time.

The 3M MWUR9 Windo-Weld Round Ribbon Sealer kit features a 15-foot roll of 1/4 inch black sealer with setting blocks, designed for easy installation with controlled compressability that prevents squeeze-out and light leaks. Perfect for replacing one windshield or backlite, this professional-grade product ensures a durable, clean, and precise seal every time.

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