Ptex is only a dollar a stick at any local ski shop and then you will not need to pay for shipping and handling. It comes in both black and clear depending on the color of your base. I use a blowtorch but you can also just use a lighter to ignite the end of the stick, once it is on fire it will start to melt onto your skis fill the cracks and scrape the excess off. Probably want to do it a few times to make sure everything bonds well and if you are feeling squirrelly you can take your blowtorch and hit your fresh ptext a few times to make sure that everything melts in properly. If these are just superficial scratches (ie: just surface scratches, no core showing/not deep at all) then do not use ptex just wax your skis and everything will be gravy.