I have had a lot of luck with the clear sticks. The trick I have used is to warm the base with a clean iron or even a small torch. WARM, not melting and be sure it is clean and deburred:nono:. Get the candle burning and use a metal pan or putty knife to roll/turn the still burning candle at a 45 degree angle against the metal. Be sure to keep the candle burning. Keep a lighter or torch handy. This rolling effect on the metal surface will get rid of the soot from the candle. Soot is VERY bad for adhesion...Quickly and carefully, get the candle to the wound. I will just place the pan or putty knife right next to the wound. Almost like welding, drip and push the candle gently into the wound and work your way 2 steps/drips forward, one drip/step back and so on...until filled. By keeping the candle burning and pretty much touching the base/wound the entire time. The further away from the base, the more likely to soot up. A nice blue flame is the key. Any tuners agree or have other advice? Hope this helps:o