Learn how to use black/clear p-tex (ptex) to repair bases and other tips/tricks like how to prevent clear p-tex from getting black carbon spots. 

• List of what you need: Clear or black P-Tex candles; Knife; matches/lighter; Plexiglass scraper; Metal scraper; Sandpaper, 320 grit; Grey base pad.  The key items are all in the racewax store.
• Small nicks and scratches should be left alone
• Repair gouges that are deep enough to interfere with structure
• You may use base cleaner to clean the area to be repaired, but do not use cleaner on the entire base.
• Before starting the process of dripping p-tex, remove any flammable cleaners from the work area to a safe place.
• Sharpen the end of the p-tex candle so it will light easier.
• Light one end of a P-Tex candle with a match/torch; hold the candle above the flame.
• CAUTION! A P-Tex candle burns very hot (>970 F); Severe burns can result if dripped on skin.
• Ventilate room if you recently used fluoro waxes.
• Hold the candle close to the base to reduce carbon formation (see above) from the burning process.
• Use the metal scraper to catch any unwanted p-tex drips as you move to the damaged area.
• Keep the candle spinning to reduce the build up of unsighlty carbon that not only looks bad in the repair, but weakens the bond as well. If carbon does appear, dab it off on the metal scraper.
• Take your time and let the p-tex flow into the gouges slowly. Going slowly will let the base preheat and accept the p-tex better.
• If the p-tex continues to burn on the base, blow the flame out so the base does not overheat.
• Deeper gouges should be filled in multiple passes, allowing each layer to cool before adding the next.
• After repairs have cooled, remove excess material with a metal scraper.
• Sand with 320 grit sandpaper and the gray base pad (from the 3-pad set I sell in my racewax store).
• Remove any micro hairs by making a few passes with a sharp plexiglass scraper.
• Structure if needed with a coarse metal brush and gray pad. Use a rilling bar if needed.
• To prevent carbon formation when using p-tex: The key is to maintain a blue flame (don't let it burn orange). To do this, keep it low to the base or close to a metal scraper. This will minimize carbon buildup. First light, then, holding the candle at a 45 degree angle and rotate the lit portion against the metal scraper to get rid of the carbon. What that also means is that you're holding a metal scraper in your off hand, rotating the candle and scraping off the black drips, then bringing both scraper and ptex next to the section to be repaired. It is hard to describe, but basically, get as low as you can without putting out the flame. Here the ptex no longer drips, but the ptex becomes molten and pours out in one long run. The carbon floats on top and when you scrape it, it comes right off.