YO GEORGIANS! :)

It's the side of the travel trailer I'm making into a coop. It's made of tin
The repair is not difficult at all. Here's what you need to do:
Supplies:
Bondo
filler (or similar product) - You can get Bondo or a similar product at WalMart or any automotive shop. Body shops will have it available as well. Also, if any of the holes are too large to keep the Bondo in place, use a backing such as a piece of metal screen or 1/4" hardware cloth in order to hold the Bondo in place.
Tools:
Disc Grinder
- Harbor Freight has a decent one (4 1/2" wheel) for under $20. Use with either a very course sanding wheel or even a metal cutoff wheel (if you are VERY careful).
Putty Knife - To apply the Bondo.
Disposable Gloves - To keep the Bondo off of your hands.
Paint - Spray paint will work fine.

Procedure:
1. Use a disc grinder to grind away the rust. It doesn't matter if you end up with a larger hole. What's important is to remove as much rust as possible and get down to the shiny metal. If you don't get all of the rust, the metal will continue oxidize (rust) even after the repair. Do all grinding and prepping before you start mixing and using Bondo.
2. Once you're down to the shiny metal, make sure no metal rough edges stick out. In fact, it's best to have somewhat of an indention for the Bondo filler to fill. You can even gently bang in the repair area with a hammer. This is part of the prepping process.
3. Now you're ready to mix and apply Bondo filler to the hole(s). You need to mix the catalyst into the filler in order for the hardening process to begin. It's simple to do.
4. After you have filled all holes with Bondo, wait for it to dry. Usually overnight.
5. You can now sand and/or paint the repaired areas.
 
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Augggh! What is going on! Broodies! Broodies! Broodies everywhere! I don't want broodies! I want eggs! I have 4 broodies now! Two in a crate I'm trying to break and now two more! Is my coop just too comfortable????
 
My new coop has rusted out spots , anyone have suggestions on a good sealant to use to cover it?
One more thing, Missy: There is another method you can use to provide a backing if a hole is too large for Bondo to fill. Some people use that foam-in-can stuff to fill the void, and then apply Bondo over that once the foam dries. It's a quick and easy way to get the job done. Best of luck.
 

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