Take a hit to your board's base that exposed the fiberglass and core? Patch that little devil up. Sealing up said hole is crucial to the longevity of your board. Although best fixed by a shop, here's a DIY technique.
How To: Fix A Core Shot
1. Clean it up
Cut away hangnails and bulges in the base and avoid slicing straight lines and blunt edges. Then clean up the scene by scraping out any rock pieces or loose material. Try to cut with the blade angled inward of the damaged area to create a lip for new base material to cling.
2. Scuff it up
Scuff up the damaged area with sandpaper or a wire brush, then wipe away any debris with a cloth and some base cleaner. If the gouge is deep into the wood core, apply a very thin coating of epoxy to the damaged area, being careful not to build up too much around the edges. Keep the board base up and let cure.
3. Seal 'er
Pick up a basic base repair iron (slidewright.com, svst.com, or tognar.com) with a wide, flat tip, and some base repair wire (a blend of base material and epoxy). With your board at room temperature, melt the material into the gouge quickly and cleanly, slightly overfilling the crater.
Immediately after filling the hole, place a metal scraper over the area and cover it with rag to protect your hand from the heat, then use some serious elbow grease and push down on the wound. Hold for at least 60 seconds. If there are still holes, repeat step three. Then let cool to room temperature and carefully scrape away excess material with a bastard file or sharp scraper until smooth.
Just the tip
Huffing melting plastic is gross. Make sure to vent your workspace or the next thing you know you'll be huffing jenkem like a freak.
Illustrations: Shawn O'Keefe