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Buy a gummy stone http://www.backcountry.com/swix-gummy-stone?CMP_SKU=SWI0115&MER=0406&CMP_ID=SH_FRO001&mv_pc=r126&003=7162907&010=SWI0115-GSRED-ONSI&mr:trackingCode=883BFC15-9B04-E011-887D-0019B9C043EB&mr:referralID=NA
Gummy stones suck for the amount of detuning you would want for rails. Just use a hand file and go at it. Don't rely on rails to do the detuning for you. That leads to more catching, and it fucks up the edge more in the short and long term.
Also, as said in another thread, use Gear Talk for this shit.
I've definitely heard that gummy stones work well but I usually just let the skis detune themselves by hitting rails. It takes a day, but then I've found that it's the most natural way to detune them because you're applying the same pressure to each area of the edge as you will throughout the ski's lifetime, if that makes sense.
same here this works great for me.....plus who wants to detune like the tips and tails and the part that hooks when you go in for a turn. I find underfoot is generally all i need some people though want more up to you op
use a gummy stone but if you are going to dull them just do the tips and middle because if you dull the hole ski you wont be able to carve in the hard snow
i bought a medium and fine sanding sponge from home depot for $4. i detuned directly underfoot (medium followed by fine) until it was a bit round, just so it doesn't bite as much. works fine.