While sanding off my previous paint mess, I re-discovered that my Dart's front fenders have six badge holes (each). After looking at pics, the original badges appear to be a "Dart" and a big gaudy "Swinger" in script. I may keep the two DARTs but definitely not the "Swinger". So I have a bunch of 1/8" holes to fill.

There seem to be several approaches:

1) Countersink the holes and use body filler or epoxy putty;
2) MIG the holes and grind smooth, probably followed by a skim coat of filler;
3) Punch tiny plugs from sheet metal and TIG them in place. I found an article in "Super Chevy" showing it done without even needing filler.

I don't have a TIG, and I am not confident in my ability to MIG holes in sheetmetal neatly. I did it on a '65 Ford truck hood a long time ago and it came out OK, but that was heavier-gauge metal and the rest of the truck looked crappy so it wasn't as critical.

What do you all recommend?
thanks.

Put a piece of brass behind the hole and mig them. Then grind them smooth.

Yes, plug the holes from the back as mentioned above. Let the metal cool before doing the next one since the holes are close together.

I like to grind welds close to flush with an abrasive sanding disc (sandpaper "flapper wheel" or whatever they are called) rather than a rigid grinding disc and then carefully hand file the last bit to match the adjacent metal. Takes longer, but worth it.

If you do it right you should be able to get it fixed with nothing more than a few coats of primer and some blocking to get it flattened out.

brass or copper backing ,right angle die grinder with roloc pad with 50 grit disc till you reach fender surface then switch scotch brite disc to finely polish to all scratches.

Sounds like the plan is to add metal

Since this isn't a structural area, what about soldering the holes shut? Won't the low temp (compared to welding) reduce the risk of warping the fender, and also eliminate the possibility of burning a bigger hole?

Practice welding holes shut on some scrap of the same gauge until your good enough to weld on the car.

No opinions on soldering?
http://www.hotrod.com/articles/3065/

Screw a sheet metal screw in holes cut/grind smooth apply a little metal to metal body filler sand down with 320 apply primer and your ready to go. No heat so no chance of messing up panel . Might be your best way to go if not sure of your mig

I had already thought of using flat head (countersunk) pop rivets, too... lots of ways to fill a hole!

How about finding someone local who is proficient with welding and pay them a few $$$ to come by your place and weld the holes shut for you? Probably take a whole 15 minutes to do both sides of the car.

Better yet have them walk you thru setting up the welder so you know how to do it?

Welding a small hole shut is not in the same warpage risk category as say welding on an entire new quarter panel.

I live in a rural area with the usual subpopulation of thieves and meth-heads, and don't know anyone I would trust to come see my shop... besides I am trying to do everything myself that I can.

Today I decided to try soldering (having previously used 80 grit to bare metal). I used a propane torch, brush-on plumbing flux and lead-free solder (for its wider plastic range). I have many years of experience with electronic and copper-tubing soldering. Even so, it took me a few minutes to learn how to control the heat without dropping the puddle... took a few tries but I quickly got the hang of it and filled all eight holes.

Then I sanded them all down with 80 grit Roloc discs, went over the entire area with 220 grit on a sanding board, cleaned all the flux residue carefully with water and then grease & wax remover, dried everything and shot a couple of light coats of spray can etching primer. Even with a bright light at an angle, I can't see any trace of the holes