Will this adhere to a slick surface such as aluminum flashing?

Paint especially rattle cans don't tend to adhere to anything slippery, you must at least use something abrasive against it to some degree even if it's only a scour pad just to rough up the surface a little bit.

Would this work in the spare tire compartment located inside a cars' trunk?

Yes. Works pretty much anywhere

Is the undercoating product acid resistant?

I have no idea I bought it cove a mount for a fish finder. I didn’t like it it didn’t dry maybe I put to thick a coat

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Description

🛠️ Protect your ride like a pro—because rust waits for no one!

BULK PACK VALUE - Six 15 oz cans provide up to 72 sq. ft. of premium undercoating coverage—perfect for serious vehicle care
FAST DRY EFFICIENCY - Touch dry in just 30 minutes to get your vehicle back on the road faster
ULTIMATE RUST DEFENSE - Rubberized coating shields metal underbodies from water, salt, and chemical damage
PRECISION SPRAY CONTROL - Wide comfort tip with any-angle spray technology for effortless application—even upside down
NOISE DAMAGE REDUCTION - Deadens road noise and protects parts from abrasion for a smoother, quieter ride

Rust-Oleum 248657-6PK Undercoating Spray offers a durable, rubberized matte finish that protects vehicle underbodies from corrosion, water, salt, and chemical damage. Each 15 oz can covers 10-12 sq. ft. and dries to the touch in 30 minutes. Featuring a wide comfort spray tip and any-angle spray technology, it ensures easy, precise application even in hard-to-reach areas. This 6-pack delivers professional-grade protection and noise reduction for cars, trucks, trailers, and RVs.

Specifications

Brand	Rust-Oleum
Color	Black
Finish Type	Matte
Size	15 Ounce (Pack of 6)
Item Volume	15 Fluid Ounces
Special Feature	Corrosion Resistant
Unit Count	90.0 Ounce
Paint Type	Spray
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal
Indoor/Outdoor Usage	Outdoor
Item Form	Aerosol
Is Waterproof	True
Model Name	Automotive Undercoating Spray
Package Information	Can
Color Code	Black
Coverage	10-12 sq. ft. per can
Global Trade Identification Number	10020066195578
Manufacturer	Rust-Oleum
Dry Time In Hours	0.5
Part Number	248657
Item Weight	7.65 pounds
Product Dimensions	2.63 x 2.63 x 9.5 inches
Item model number	248657
Style	Spray
Finish	Matte
Item Package Quantity	1
Number Of Pieces	6
Special Features	Corrosion Resistant
Batteries Required?	No

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