CarCareTruth Score
Decent, but it's tough on the environment.
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Last reviewed July 12, 2026
TL;DR A no-tools emergency kit for drivers who want one button between them and a driveable tire · the integrated sealant-plus-inflate operation is genuinely simpler than managing separate steps. No independent fill-time data exists yet, and the unit carries no NRTL electrical certification.
The Slime 50158 is a corded 12V flat tire repair kit that combines sealant delivery and inflation in a single automated sequence: plug the hose into the valve stem, plug the unit into the 12V accessory outlet, press the button, and the kit injects sealant and inflates the tire without any additional steps. It is designed for standard passenger cars and trailers · the sibling model 50159 carries more sealant for larger SUV and truck tires. Slime explicitly confirms the included sealant formula is TPMS-safe, a critical claim for any modern vehicle built after 2008. Per the manufacturer's guidance, this is an emergency temporary repair rated for up to 100 miles or 3 days before a tire shop visit. The sealant bottle is refillable (replacement: Part #10201), meaning the inflator has ongoing utility beyond a single emergency. The early owner feedback is positive, but the review base is still modest and the product only launched in March 2024, so long-term reliability data is not yet available.
The right buyer is a driver who has replaced run-flat tires or owns a vehicle with no spare and wants a single trunk kit that handles a roadside flat without tools or jacking. owners replacing run-flat tires on vehicles like a MINI JCW or a Lexus NX450h+ specifically cite this as the purchase that completes their no-spare setup. Skip it if you drive an SUV or pickup with larger tires · the SUV/Truck variant (50159) is the correct choice, and owners confirm the 50158 is undersized for bigger tires. Also skip it if you need AC or cordless operation: this unit is strictly 12V corded.
The unit is a 12V corded electrical device with no chemical SDS · there is no chemical exposure pathway in normal use. It carries no UL or ETL listing (both databases searched 2026-05-26; no listing found). No active CPSC recall exists as of 2026-05-26. The product listing includes a California Prop 65 warning. For end-of-life disposal, the inflator qualifies for standard e-waste drop-off (Best Buy, municipal e-waste events). The case is polypropylene (PP-05 recycling symbol visible) and is accepted at standard plastics recycling programs once cleaned.
The Amazon listing for Slime 50158 Smart Spair Ultra Flat Tire Repair Kit carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including electronics with wiring, solder joints, or plastic/metal housings — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive electronics product, Slime 50158 Smart Spair Ultra Flat Tire Repair Kit has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Slime, via Amazon. Not editorial.
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