Over the Counter Zinc Additive

Im with you Gator. Ive used the stuff for fourty plus years and never had a problem. Remember the commercial they had years ago where they would dip a screwdriver in the STP and see if anyone could hold on to it ? There was a salesman at the gas station I worked at when I was 16 or so and I held it without slipping threw my fingers. My boss was laughing at the guy and he said," There is always a smart A$$ in every crowd" He gave me a free can ! Anyway the stuff works great or it wouldnt be on the shelves as long as it has.