Today I worked at a property. During the job I had a conversation with the owner. I asked him how old he was? He replied 95 years. I then asked what he did in his working life?
His career he stated was to develop chemical products and sell them to the plumbing trade.
Yes today I worked at Erv Pryors home ... the founder, President and CEO of ... SOS Products Company E. Greenville, PA
PS: I also asked what was the first product ? Soot Destroyer circa 1935
was the first he said.
His son now runs the company...
Personally I use their plastic-putty (best putty I ever found), lime solvent, wax rings when I don't use rubber, their epoxy which has the hardner in the middle.