I occasionally use Sea Foam also; along with Stabil. No problems so far this spring with the up-to-10% ethanol in Washington's gasoline. Float bowls are clean and jets clean as a whistle. No discoloration anywhere. OTOH, our small motor shops are jammed with lawnmowers and weedeaters that didn't get the Stabil treatment over the winter.
I have to change the oil and fire up my lawn mower this weekend. The warm weather has the grass growing at a good pace. The weedeater needs some attention too. I have a very long fence line.