You really shouldn't be grinding your skis every time you p-tex. You have a finite number of grinds before you wear your edges down to thin. And really unless you are a big time racer / pro that needs your shit to be the fastest thing out every time you step on the snow it's not necessary unless you did some really fucked damage that could lead to base delamination or core rot. Using a ptex candle or a gun and prepping the base area with either epoxy or just getting it really damn clean with base cleaner / rubbing alcohol should make sure that it wont tear our in any situation. Let it set with a metal scraper c-clamped to the repaired area. Then just take a base planer (not that expensive) or if you really don't give a shit a chisel and flatten it out till it's smooth.
If you are doing a ton of damage to your skis (because you ski park or really just love finding rocks) you just shouldn't care that much unless the scratches really net down to the core of your ski or are along the edge area and could cause an edge rip out if it gets caught again.
The equipment I mentioned in the fix above (p-tex candles, rubbing alcohol, 2 stage water proof epoxy, and a chisel) are cheap and pretty much what you need (other than wax and an iron) to fix most of the things wrong with the bases of your skis. It's cheap, you don't need to be rich. Just a smart tech. You don't need a wintersteiger machine every time you fuck your shit. Only when you really, really, really, fuck your shit.
There is a general problem with most people grinding their skis to often and therefore shortening the life of a ski. Don't do it. Only get a grind when it is really necessary.
It's even less necessary to have nice pretty clean bases on pow skis. Fuck that shit up real good before taking it in (unless it's a core shot or near the edge).
/rant.
shoplife.
