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I just stitched mine, and I don't think I could have done it without a flap wheel.
Whoever invented those things should be nominated for a nobel prize.
One tip, keep a knotted wire wheel for removing seam sealer and a worn out flap wheel for paint removal.
I say worn out because I'm finishing out a spool of flux core and keep a lot of 80 and 60 grit flap wheels around for cleaning up my ugly welds and removing the grip of slag/spatter that fuckscore leaves behind. So I have a lot of worn out 60 grit flapwheels, and they're great.
They're still abrasive enough to cut through paint like nothing, but not like a new flapwheel where you can gouge sheetmetal pretty badly if you catch the corner of the disc on something.
But a knotted wire wheel is the best thing I've found so far for removing seam sealer. Also, wear goggles and make sure the inside of the car is free of anything you think you could boner up with an errant spark.
I rarely wear goggles, but am going to start after getting a piece of gooey, hot, melted seam sealer on my eyelid.
It also sucks when you do the engine bay before stripping the interior out and start a fire on the interior side of the firewall when stitching the back side of the wheelwell. The asphalt crap on the floor burns like hell and smells awful.
Oh yeah, and cover your windows with a wet towel if you are welding right next to it. Spatter pits glass and once it's pitted, it's a pain in the ass to clean for the rest of time because your paper towel hang ups and gets all shredded and stuff.
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