Anybody use this "sandpaper"? - Printable Version +- Woodnet Forums (https://www.forums.woodnet.net) +-- Thread: Anybody use this "sandpaper"? (/showthread.php?tid=7346855) |
Anybody use this "sandpaper"? - Tony (Charleston WV) - 03-05-2019 Just curious. Even if the claims of the seller are reasonably accurate, I'd have a problem paying $120 for three grits of anything. There's also the issue that it's likely that I'll be moldering in the ground before I could make use of the claimed lifespan. Tangent alert: I have a real minor heart issue and when I asked my cardiologist what the likely prognosis would be, he told me not to worry--"you'll be dead before it kills you". Thanks. Oops. Sorry. here RE: Anybody use this "sandpaper"? - EricU - 03-05-2019 is this a game of stump the dummy? What sandpaper? RE: Anybody use this "sandpaper"? - Admiral - 03-05-2019 (03-05-2019, 06:14 PM)Tony (Charleston WV) Wrote: Just curious. Even if the claims of the seller are reasonably accurate, I'd have a problem paying $120 for three grits of anything. There's also the issue that it's likely that I'll be moldering in the ground before I could make use of the claimed lifespan. Tangent alert: I have a real minor heart issue and when I asked my cardiologist what the likely prognosis would be, he told me not to worry--"you'll be dead before it kills you". Link missing.... RE: Anybody use this "sandpaper"? - Alan S - 03-05-2019 (03-05-2019, 06:58 PM)Admiral Wrote: Link missing.... Likely Dura Grit, mentioned by Stumpy Nubs. RE: Anybody use this "sandpaper"? - mvflaim - 03-05-2019 (03-05-2019, 08:30 PM)Alan S Wrote: Likely Dura Grit, mentioned by Stumpy Nubs. I had one of those things. Bought it 30 years ago at The Woodworking Show. Worked until the sheet metal bent. There were also round metal discs you'd put on a random orbital sander and spin it like crazy. Dangerous as hell when the disc flew off. RE: Anybody use this "sandpaper"? - Tony (Charleston WV) - 03-05-2019 Folks: Here RE: Anybody use this "sandpaper"? - AHill - 03-06-2019 "Lasts 100x longer" but an 8x10 sheet of Norton 3M ProSand is $1.50. But since a standard sheet of sandpaper is 8x10" and the Dura-Grit is only 2.5" x 5" (almost 8x as much area as the Dura-Grit block), then even if it lasts 100x longer than sandpaper, it's still 2x more expensive compared to sandpaper (take the area of the "sandpaper" and divide by the area; then multiply the cost of the standard sandpaper by 100). RE: Anybody use this "sandpaper"? - Peter Tremblay - 03-06-2019 (03-06-2019, 07:24 AM)AHill Wrote: "Lasts 100x longer" but an 8x10 sheet of Norton 3M ProSand is $1.50. But since a standard sheet of sandpaper is 8x10" and the Dura-Grit is only 2.5" x 5" (almost 8x as much area as the Dura-Grit block), then even if it lasts 100x longer than sandpaper, it's still 2x more expensive compared to sandpaper (take the area of the "sandpaper" and divide by the area; then multiply the cost of the standard sandpaper by 100). I'm grateful that someone did the math. I was wondering how this worked out. Thanks RE: Anybody use this "sandpaper"? - Rob Young - 03-06-2019 (03-06-2019, 07:24 AM)AHill Wrote: "Lasts 100x longer" but an 8x10 sheet of Norton 3M ProSand is $1.50. But since a standard sheet of sandpaper is 8x10" and the Dura-Grit is only 2.5" x 5" (almost 8x as much area as the Dura-Grit block), then even if it lasts 100x longer than sandpaper, it's still 2x more expensive compared to sandpaper (take the area of the "sandpaper" and divide by the area; then multiply the cost of the standard sandpaper by 100).Agreed. I get 3x the cost using $1.31 per sheet for the 3M "pro" grade paper just based on square inches. $1.31/(9*11) = $0.013/square inch for paper $38.23/(5.5*2) = $3.48/square inch for block But, heck toss in the cost of a couple cans of spray adhesive so you can make a square edge block once in a while (considering the wood as $0.00) then it still comes out between 2x and 3x. It gets only slightly better if one uses the cost of pre-glued rolls of sand paper instead. 3M stikit gold 2.75" x 75ft runs about $60. $60/(2.75x75x12) = $0.024/in^2 which still comes out ahead on the 100x cost claim. RE: Anybody use this "sandpaper"? - AHill - 03-06-2019 (03-06-2019, 09:22 AM)Rob Young Wrote: Agreed. My bad. I used 8x10 instead of 9x11. Thanks for catching my error. |