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sciencing.com/how-6585898-put-magnetic-signs-onto-aluminum.html

Magnetic signage for advertising is extremely effective, especially placed on the sides of vehicles and other metallic surfaces. Aluminum is obviously the exception, being non-magnetic. Fortunately, there are other non-permanent yet secure methods for attaching these signs to aluminum surfaces. Commonly used in the ...

www.reference.com/science/magnet-stick-aluminum-6dbea0d1727ac5b5

Under normal circumstances, a common magnet does not stick to aluminum. Under the right conditions, however, it is possible to get a strong magnet to interact with aluminum, though never to the extent that it works with ferrous metals.

www.magnets.com/blog/what-materials-do-magnets-stick-to.html

However, that is only partly true because magnets stick to some types of metals and not others. For example, imagine you have two metal cabinets right in front of you, one is aluminum and one is steel. When you try to stick your magnets on the cabinets, the magnet will slide off the aluminum cabinet and stick firmly to the steel cabinet.

www.reference.com/science/types-metals-magnets-stick-4572af40b0befeaf

Magnets stick to any metal that contains iron, cobalt or nickel. Iron is found in steel, so steel attracts a magnet and sticks to it. Stainless steel, however, does not attract a magnet. Iron or steel are often added to other metals to make them stronger. The weaker metal will not attract the magnet, but the addition will.

properdesign.uk/blogs/news/89748038-how-to-stick-magnetic-signs-to-aluminium-cars

How to Stick Magnetic Signs to Aluminium Cars and Trucks January 26 2016, 3 Comments Lots of cars, trucks and vans have Aluminium panels these days. It's a fantastic material as it's light weight for it's strength making it popular amongst high end manufacturers such as Audi and BMW.

www.straightdope.com/columns/read/940/why-dont-magnets-stick-to-aluminum

The material as a whole becomes magnetized and sticks to the magnet. Aluminum doesn’t contain tiny magnets, so there’s nothing to get organized and nothing for the big magnet to stick to. Certain restless intellects out there may now be wondering: what’s with this tiny magnet crap, anyway? That’s where the electron shells come in.

terpconnect.umd.edu/~wbreslyn/magnets/is-aluminium-magnetic.html

Is Aluminum Magnetic? In our everyday experience aluminum doesn't stick to magnets (neither does copper). The question of whether aluminum is magnetic is a bit more involved and depends what you mean by the term "magnetic". Most matter will exhibit some magnetic attraction when under high enough magnetic fields.

science.howstuffworks.com/magnet.htm

Magnets are instrumental to preventing this condition. One practice involves passing a magnet over the cows' food to remove metal objects. Another is to feed magnets to the cows. Long, narrow alnico magnets, known as cow magnets, can attract pieces of metal and help prevent them from injuring the cow's stomach. The ingested magnets help protect ...

signs101.com/threads/new-ford-aluminum-trucks-no-magnets-options.133701

GM will have aluminum trucks for the 2018 model year IIRC. Dodge will probably be right after that. About 10 years ago there was a super thin, reusable material that stuck real well, and I don't think it was magnetic. Manufacturer stopped making it. Something about high cost and poor sales. Can't for the life of me remember the trade name.

sciencing.com/kinds-do-not-stick-magnets-6832309.html

A magnet is a piece of metal with the ability to attract other metals. The Earth itself is a huge magnet. It has two ends called poles, a north-seeking pole and a south-seeking pole, and an invisible area of magnetism surrounding it called a magnetic field.