Vel tar is best for tune kits where parts are machined to very close specs. Use Heavy tar on OEM guns where the guides and spring have a poor fit. Heavy tar is best at dampening. I use both- (Vel -discontinued) on steel or brass guides and Heavy tar on the OD of the spring.
Safety Data Information;
NOT OSHA REGULATED
Carcinogenicity- NTP? NO
IARC Momographs- NO
OSHA REGULATED- NO
Emergency And First Aid Procedures
EYE CONTACT- Flush with clear water for 10-15 minutes or until irritation subsides.
If irritation persists consult a physician.
SKIN CONTACT-Wash with soap and water. Oil resistant gloves may be used if required or needed.
INHALATION- Inhalation at room temperature is not a problem. If overcome by vapor from a heated product, immediately remove from exposure and call a physician.
INGESTION- If ingested call a physician immediately. Do not induce vomiting.