That gluey gunge is like bogeys. Make sure you have something to stick them on and your fine lol!
I had a wall and then a piece of card board.
You have to make sure the metal is as clean as you can get it. Scratch it up a bit or rub it down with some fine sand paper. Make sure the goo is gone or the solder won't stick.
I ended up with this
Norfy got me thinking about plastic card stuff. So this happened
Then I went around the edge with some pu sealant (it's what I had open)
And this was the end product
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