Wing mirror causing damage

Most of the time water is not going to damage anything that will not get replaced with the new mirror. However, as you are concerned you could use what we call foil tape. It is used to seal metal heating ducts and such. Basically an aluminum foil with a glue on the back. It sticks very well (some "shady" body shops use it under a layer of filler instead of actually welding in metal). The picture is the type of tape I mean. Probably sold there as well in a hardware or home type store. Wipe off the housing and stick it on. Then rub over it with something like a piece of plastic to smooth it down and make it stick.

From what I can see that actually should be repairable. You might be able to correct a lot of it yourself by setting the mirror in and gently tapping on the trim ring with a wood or plastic hammer. It also looks like it is just the trim ring that took the brunt of the damage. If you got that formed back into place a bit of touch up and nobody but you and I would know, and I am not telling (I also looked and that mirror is not that pricey, having a replacement painted to match would cost as much).

Okay using the picture as a reference, adjust the mirror so it moves the way I added the arrows, that will move the edge toward the orange in and out of the way a bit.
Now you need to use something to pull the orange area out, it is pushed in. If you stand over it and look straight down you will see it has to twist clockwise as it comes out. Then it will set back into place. I would use a small plastic mallet and a block of wood as a backer so the trim moves but not the housing. The only tricky part is moving it without breaking it.

If I could find an exploded view of that mirror it would be helpful but no luck yet. Tool wise, It really depends on what you have and what you want to do.
For me I would remove the mirror, strip it down, use a few trim and ding hammers and dollies and form the trim piece back to original shape. But unless you have all those tools already a replacement mirror is cheaper.
So use pliers with a rag on the jaws to twist the piece, a hammer to tap it back, basically use what you have.
A backer is simply something placed behind the part you intend to hammer on. It helps absorb the blow and holds the part in place so you are not just bouncing off. The picture shows how a backer works. In this case it is a real body dolly, but a piece of wood with a towel over it would work.

It looks like the area that the light sets is squeezed together. I sort of highlighted it on the picture. The area with the orange arrow needs to be spread open to match the yellow and pink areas. That would open the notch and let it set into place. The green arrows show the way the corners need to move. The circled area shows that the trim piece is shrunk due to the damage in that notch where the light goes. If you can find a pair of pliers like the other picture it would make forming that area easy.

But it is looking a lot better than it was already. No big gaping hole.

Without having it in my hands I cannot say take it apart or not. Some come apart easy, but then they do not go back together because of the way they are assembled at the factory. If it has screws/pins you can remove or snap tabs then maybe. But it is your vehicle and you are right there so it is your option. It would make it easier, but?

Great job Steve W!

You're very welcome.

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