Can I use it on my mountain bike wheels and chain?

You COULD in a pinch but shouldn't, you'll want to find an appropriate lubricant that isn't also a penetrant. Basically, this isn't lubey enough for your needs.

Can I use it on door hinges that are squeeky?

You can, and it will get into the hinge quite well and should stop the squeak. But it will evaporate over time, so I tend to use oil, such as 3 in 1 or even motor oil. Let it drip from the top and wipe off any residue. I have also raised the pin a bit and let the oil drip into the hinge.

Does it cause harm to car paint?

Yes. Paint is oil based and so is wd 40.

Is it suitable for garage doors that get hung up

Yes, however you are better off using WD-40's Specialist Gel Lubricant for a garage door. The gel lubricant will stay in the general area where you spray it, regular WD-40 will run down the track provide less friction control where you need it.

ASIN	B00JIHTCQ4
Best Sellers Rank	#1,577 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #12 in Industrial Lubricants
Brand	WD-40
Customer Reviews	4.8 4.8 out of 5 stars (1,795)
Date First Available	April 3, 2014
Flash Point	131 Degrees Fahrenheit
Global Trade Identification Number	10079567490057
Item Form	Spray
Item Weight	1.06 pounds
Item model number	490057CT
Liquid Volume	12 Fluid Ounces
Manufacturer	WD-40 Company
Manufacturer Part Number	490057CT
Material	Metal
Model	Multi-use Product Lubricant
Number of Items	12
Package Information	Can
Product Dimensions	3 x 9 x 3 inches
Recommended Uses For Product	Office,Home
Specific Uses For Product	General Maintenance and Rust Prevention in Office and Home Environments
Unit Count	12.0 Count
Viscosity	Medium to low

Classic Formula, Multi-Use Product, Lubricates & Protects Metal from Rust & Corrosion, Drives Out Moisture & Frees Grease & Grime from Multiple Surfaces, 12 OZ [12-Pack]

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