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!

MATTE BLACK FINISH - Sleek, non-glossy finish that blends seamlessly with your vehicle’s underbody for a professional look.
NOISE REDUCING ARMOR - Deadens road noise and protects undercarriage parts, elevating your driving experience.
ULTIMATE RUST DEFENSE - Rubberized formula shields metal from corrosion, water, salt & chemicals for long-lasting protection.
EFFORTLESS APPLICATION - Comfort spray tip with any-angle technology lets you spray upside down for precision and ease.
FAST EFFICIENT COVERAGE - Covers up to 12 sq. ft. per can and dries to touch in just 30 minutes—get back on the road faster.

Rust-Oleum 248657 Rubberized Undercoating Spray is a 15 oz aerosol designed to protect vehicle underbodies from rust, corrosion, and road damage. It dries quickly in 30 minutes, covers up to 12 sq. ft., reduces road noise, and features an easy-to-use comfort spray tip with any-angle spray technology for precise application on metal surfaces.

Specifications

Brand	Rust-Oleum
Color	Black
Finish Type	Matte
Size	15 Ounce (Pack of 1)
Item Volume	443.6 Milliliters
Special Feature	Rust Resistant
Unit Count	15.0 Ounce
Paint Type	Spray
Specific Uses For Product	Exterior
Surface Recommendation	Metal
Indoor/Outdoor Usage	Outdoor
Item Form	Aerosol
Included Components	Rust-Oleum Black Undercoating 15 oz. (12 Pack)
Is Waterproof	True
Model Name	Rust-Oleum Black Undercoating 15 oz. (12 Pack)
Package Information	Can
Color Code	12 sq ft
Full Cure Time	3E+1 Minutes
Coverage	12 sq ft
Water Resistance Level	Water Resistant
UPC	020066185985
Global Trade Identification Number	00020066185985
Manufacturer	Rust-Oleum
Part Number	248657
Item Weight	1 pounds
Product Dimensions	10 x 2.99 x 2.99 inches
Item model number	248657
Is Discontinued By Manufacturer	No
Style	Spray
Finish	Matte
Material	Plastic
Item Package Quantity	1
Special Features	Rust Resistant
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

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