Originally Posted by BigE
How deep should a gouge/scratch on the base be before you try to fill it with ptex? (Do you need it to be a certain depth before the ptex will stick?)
I'll assume you mean a) 'stick to the ski while I scrape it down to level' as opposed to b) 'stick to the ski at all' or c) 'stick to the ski while I'm skiing'
a) This is really the function of the scraper. The finer the shavings you can take off, the less likely you'll pull out the repair. The wood chisel suggestion is a good one, but for maximum effect take a look at SkiMangoJazz' scraper burnishing suggestions.
b) This is a function of base cleanliness (did you degrease them?) and temperature as the repair goes on. For example, I find poured candle repairs with a bit of blue flame on the base are more durable than dripped ones (my major trouble with dipstik's tuning guide, BTW)
c) aside from a,b, there is also the question of how well matched the TCoE of the repair is to that of the base. With Elan's clear sintered and black gadolinium bases I couldn't get almost anything short of metalgrip to hold.
I think sjjohnston has very fair points, and I have yet to get Toko repair powder to work for me on the 'not quite worth it' smaller scratches. Probably because I'm not heating the whole assembly (ski, powder, cover patch) enough.