Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Would it work on a metal door?
Document: Did not stick to my front door. Would only stick to my fridge. Have funny turkey wreath on it now but cannot be used for any others because they are all too big. Was hopeful it would work but will try something else.
I use this giant suction cup to hold up wreaths on my glass front door. About a year ago we got the glass door in addition to the traditional Front door. I used to use an over the door wreath hanger but with both doors, most wreaths wont fit in between the two so I decided to try this. I was skeptical it would work but amazingly enough, it does! The worst that has happened in several months continuous use is the cup slid down the door nor hot summer night.
I bought a new wreath for Christmas and needed a way to hang it in the window and thought a hook on a suction cup would be the easiest way. These are just what I needed and they work just fine. They are very easy to use and stay up till you take them down. They don't come loose by themselves. I'm very pleased with this product and would recommend them for anyone needing to hang somthing on a window mirror or any smooth surface.
We bought this to hang on the inside of our metal front door. I hung it up a few days ago and have a rather heavy piece hanging from it right now. We are pleased that it is holding so well.
It doesn't work on my door. I heard my wreath fell off the door after 15 minutes I hung it up lol..
I was skeptical but this does work on my glass front door; temperature in 30's ; it is holding a battery operated wreath that has 4d batteries in addition; works great !
I even waited for the temp to get above 40 degrees as per directions. Cleaned my window, stuck it on (with no wreath) and within 30 seconds it popped off! Waste of money! Tried again multiple times. Product doesn't work. I can't use an over the door hanger because I have an arched front door so I was disappointed this didn't work.
This suction cup is still holding strong. First used on a Fall season metal sign and now it is holding a large wreath. I need to buy more of these.
I've had 2 wreaths hanging on outside doors exposed to winter weather for a month. They are attached to the glass windows of the doors and they work great.
This will not hold a wreath at all. My Halloween wreath keeps falling down. I thought it was suppose to work on glass. Piece of junk. And yes the temp. was way above 40 degrees. The wreath weighs less than 10 pounds.
Answer: It's a standard suction cup, but works great.  We used our on windows...outside in the northeast winter.  Xmas wreaths hung for about six weeks with no issues.  Seems to me if it's a clean, smooth surface metal door, they should work.