I’m pretty positive that this would be lousy for the use in the picture above — I’d never trust my car’s finish to it — but I picked one up anyway when I found it on sale for $10. (The standard price is still only $20.) It’s actually quite handy around the shop, more for grinding than welding.
It’s also not too bad to throw underneath your makeshift welding table if you’re welding in a shop with an epoxied floor — like the Toolmonger shop. The epoxy coating is great for handling chemicals and spills — they wipe right up — but a little piece of slag’ll burn the epoxy. While the ‘blanket doesn’t always stop the slag, it does take most of the energy out, which does the job.
Like so many HF tools, it doesn’t really full-on do what it says on the package, but it’s still a decent deal when you consider what it does do vs. its price.
6′ x 6′ Welding Blanket [Harbor Freight]