Vic Smith wrote, on Wed, 09 Dec 2015 03:47:08 -0600:

Same here. I've done 4 or 5 that way. Kits cost $3-10.
They didn't come with a rasp when I was buying them.

Most of the tire repair videos do *not* use the dimpled
scraper that most of us use to repair a tire.

They pour what turns out to be MEK onto the inner liner,
which, presumably, dissolves some of the inner liner,
and then they scrape with this tool:

http://www.grainger.com/product/XTRA...Scraper-33K072
http://www.walmart.com/ip/XTRA-SEAL-...74974/40883102

After they scrape, they do "grind" the scraped area also.

They seem to prefer very low speeds when grinding, like 500rpm
and never more than 5,000 RPM.

Is that for heat reasons?