But olive oil tastes better than STP. LOL
Seriously, I would agree with Butterbean, there are a lot of other things that will cause his or others' demise. Remember that if you drink water and breathe air, I (MD Orthopedic Surgeon and BSEE) guarantee you will eventually die. That being said, there are some things about all petroleum distillates alone that can possibly cause cumulative effects, notwithstanding the effects of zinc lubricants. The MSDS for STP Oil Treatment shows the following:
GHS Classification: Physical: Not Hazardous Health: Not Hazardous
FIRST AID: Skin Contact: Rinse skin with plenty of water. If skin irritation or redness develops, seek medical attention.
PPE: Gloves: Impervious gloves such as neoprene or nitrile are recommended if needed to avoid prolonged or repeated skin contact
TOXICOLOGICAL INFORMATION: Carcinogenicity Listing: None of the components is listed as a carcinogen or potential carcinogen by IARC, NTP, ACGIH or OSHA.
So the method of STP on a sponge or rag and applied only with a dab on the fingers is PROBABLY not going to cause any significant problems. However just to be a safe as possible I would probably use while wearing a pair of nitrile gloves then a wipe off with a clean rag which should be a reasonable thing to do. DocZ