VIPER Wet Rag Heat Blocking Putty - 340gVIPER Wet Rag Heat Blocking Putty 340g RT400P Overview: Wet Rag is a reusable heat blocking putty that keeps piping and heat sensitive components cooler than a wet rag during soldering, brazing or welding. Application: Simply mold a generous amount of putty in front of the area that needs to be protected from heat. After piping has cooled remove putty and place back into jar. Remoisten with a few drops of water if putty becomes dry. Good for up to 40