Use your fingers to flatten and smooth the patch against the area of the car so it follows the contour lines of the vehicle.
Patching holes in van floor.
Now you may begin welding it 2 inches at a time.
Having removed the bolts and rivets i was left with all these holes to patch.
I bought replacement bolts since i gave away the originals with the seats and smeared them with epoxy before screwing them in.
Repeat this process inside the vehicle.
Weld both inside and out.
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Then use your fingers to make sure it s attached to the metal all the way around the hole.
It could be that your van is missing one of these or as mark mentioned in the comment on your question it could be missing something like a screw or something used to be screwed in there.
Tack weld the patch in place.
How i patched small holes in the floor after we removed the plumbing from the old tub.
Wow if someone had told me at the dealership that there were 128 holes to patch i would have probably walked.
Like big enough my pinky fit in them.
Press the patch into the hole firmly.
But since i needed some help with that the rust job got pos.
It s pretty easy when you know how.
Example of holes in the van floor.
In my van i had a few holes in the floor that i repaired using fibreglass resin and patches.
We show every step to repair a big hole in the subfloor.
Ever since i got the van i talked about fixing the rust.
This really really needed to be done.
Alternate sides while welding to prevent the floor from warping.
Before patching these holes i wanted to clean sand and paint all areas that were bare metal.
Wait an hour for the mixture to dry.
All done from the top side.
I had huge holes in the floor of my van where the seats were bolted in.
Hold the patch in place with one hand and use your mig welder to tack weld all four corners of the patch on the outside of the vehicle.