There is no way to repair a sintered base to its original form, all repair methods involve melting ptex into the gouge, which makes that area extruded ptex. You probably won't even be able to tell the difference though on such a small area
Yes I'm in a similar situation as you guys. Not huge gouges or core shots, just big enough to slow me down a bit though. Sintered base Ride DH2. Are there any ptex application guides on here? Searched but could not find anything except for posts similar to this one.
edit: also where can I buy ptex and what other equipment do I need to apply it? Is this stuff pretty toxic?
if you search youtube you can find lots of videos on how to ptex a board.
Basically all you do is clean the base, let it dry, then light the ptex candle and let it drip into the gouge, let it dry for a while, then come back and scrape off the excess with a metal scraper.
As for where to buy it, try asking about it at your local shops.