How do you dry this product? It stays sticky.

product doesn't dry stays pliable. Taillight gaskets etc.

Can this strip-calk be used for sealing gaps in sheet metal duct work in home's heating and conditioning system?

It could be used, but the color is black. They make duct sealant that is applied with a caulk gun that is meant to seal sheet metal duct work and the color is grey.

How many strips in the package?

i am pretty sure there are 60...the package is about 12 inches wide and on the side it says the material is 20 yards (60 feet)

Has anyone used this to seal a 3rd brake light in the roof of a late model pickup truck like a 2015 Ram?

This would certainly do the job, BUT it stays sticky forever. It could make removing the light to replace a bulb down the road difficult. On my 2014 Ram, I used MD Weatherstripping 01033 from the local hardware store. It's 5/16" H x 19/32" W. I had to cut wedges from the inside corners to shape it around the light. I used Permatex UltraBlack RTV (the UltraBlack is more flexible when cured than the standard black RTV) at the end joint (centered on the bottom) that I let cure for 24 hours before installing, so it took longer, but so far so good.

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🔥 Seal it once, seal it right—no cracks, no hassle!

SEAMLESS DURABILITY - Soft butyl rubber stays pliable—no cracking or shrinking over time
BULK PACK EFFICIENCY - 60 strips per pack—stock up and never run out during critical projects
INSTANT FINISH READY - Paint immediately after application—zero wait, zero rework
EFFORTLESS APPLICATION - Thumb into place and smooth with a finger—no tools, no mess
HEAT RESISTANT RELIABILITY - Withstands high temperatures—perfect for engine bays and firewalls

3M Strip-Calk 08578 is a professional-grade soft butyl rubber caulking strip designed for permanent, elastic sealing of seams, joints, and gaps. Its high-temperature resistance and immediate paintability make it ideal for automotive and industrial applications, ensuring durable, mess-free repairs with no shrinkage or brittleness.

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Manufacturer	3M
Brand	3M
Model	08578
Product Dimensions	30.81 x 10.29 x 3.38 cm; 635.03 g
Item model number	8578
Exterior	Machined
Manufacturer part number	08578
Special Features	Non Slip
Item Weight	635 g
Viscosity	Low to Medium

3M Strip Calk, 08578, 1 ft Strips, Black, Soft Butyl Rubber, Permanent Elasticity, Joint Filling, Trunk Seams, 60 Pack

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