Press them flat against the surface of the metal then secure the edges with masking tape.
How ti epoxy sheet metal behind rust holes.
On the back side of the metal use a putty knife or the applicator supplied with the kit to coat the border with epoxy filler.
Preparing the hole use coarse sandpaper to remove paint rust oil and dirt from the surrounding metal in a minimum 1 inch wide border around the hole on both sides of the metal.
I used a piece of pvc pipe a vice mount miniature metal break and body hammer kit.
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.
Notice the heavy bead 1 4 inch of adhesive along the entire bare metal contact area for positive adhesion and rust protection.
You can then trace the hole on to the backer with a marker.
Leave the rusted area exposed.
Start by drilling a small hole in the center of a backer and lay it over the rust.
In an emergency whittle a plug from a scrap of wood or tree branch and tap it into the hole.
I then used the templates to trace out the patch panels on some sheet metal.
Even banging on it will make you think you are banding on sheet metal.
Perhaps a simple rivet or sheet metal screw can be secured in the hole.
When dry overnight you will not believe how strong this repair.
Also the no contact inner areas were brush coated with eastwood s.
Cut some sheets of masking paper to size with a sharp pair of scissors.
If the hole needs to contain a liquid a rubber washer can go on the sheet metal screw to render it water tight.
Cover the surrounding metal with masking paper and tape.
If you can t see the hole through the backer you can shine a light directly on the back or from behind the hole and it should help you see better for tracing.
Place the mixed two part epoxy putty on the area of the metal you need to repair and work the epoxy putty onto the surface of the metal by apply pressure on the epoxy putty with your thumbs and fingers.