The repairing of gouges and core shots is something that you can engage in doing yourself, but it is recommended to take your skis/snowboard to specialized shops to make sure they are professionally treated. But, if you will follow a couple of common rules you should be able to make smaller repairs on your own.
First you have to analyze what the damages are. Minor lengthwise gouges under foot will not affect performance. Gouges across the base or any gouge in the extremities require repair.
Clean the area that needs to be repaired with base cleaner and trim ragged edges with a sharp blade.
For minor repairs you can sprinkle Repair Powder in gouges, cover them with Mylar and melt with iron to bond repair material into gouges. Some choose to light p-tex candles and flow melted material into gouges, but the repair doesn't wear as well. The preferred method for deeper repairs is to melt p-tex wire with a chisel tip soldering iron.
To repair core shots along the edge or where the ski core is exposed require Metal Grip. Metal Grip is a combination of polyethylene and epoxy. The epoxy bonds to the edge or core material for a lasting repair. Use a soldering iron with a chisel tip to melt Metal Grip. Finish filling repair by melting p-tex wire over Metal Grip. Smooth over repairs by sanding with 100 grit sand paper over a sanding block and keep increasing in steps of 20 to finish with 180 grit sanding paper.
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