Patching Rust Holes Sheet Metal

Insert the metal patch behind the hole.

Patching rust holes sheet metal.

Complete the feathering with 220 grit. I scraped the rest of the metal chips off of the foam. The welding process actually adds new steel to the thin steel and can result in a repaired spot that is stronger than the original metal. After slicing the patches out with a cutoff wheel next came the bending hammer and dolly session until the patches matched the holes and fit snug and flush into the flanged seat.

All of the rust needs to be removed from the hole and the metal surrounding it. Get all of the grass out of the mower deck before storing it and don t use sharp tools to clean the underside of the deck. Scrape and sand the first step was to scrape off the loose paint surrounding the rust spot and to sand off most of the rust. The most permanent repair to a hole in sheet metal is to weld the hole shut.

Then spread the patch out so it s flat against the remaining metal. I then used the templates to trace out the patch panels on some sheet metal. Then enlarge the sanded area so you ll have space to feather the edges. Have you ever welded something so thin and worn out that all you do is blow holes in it.

The patch should completely cover the hole. I found under the outer layer of metal what i thought were additional layers of rusted chipping metal was actually dense foam padding. Screwdrivers putty knives etc this just scratches the paint and allows more rust to form. Switch to 120 grit sandpaper to feather the edges of the repair area.

Reach underneath the metal if you re able to or push the patch through the hole. Another good idea when replacing any type of sheet metal is using weld through primer. If you don t have a grinder or angle grinder you can use heavy duty tin snips to cut the rust and rusting metal out of the hole. Did you want to learn how to work around that and deliver a solid re.

Keep it stuck in place by spreading a little bit of the body filler around its edges. The complexity of welding increases as the thickness of the material decreases. This high zinc paint helps protect the backside of the sheet metal from rusting a very important step in the restoration process this is something most people forget and they end up with rust bubble just a few years down the road. Sand through the rust spots down to bare metal.