According to Slime's blog,
"The red label line of Slime products is designed specifically to stop flats in tires with tubes. Tubes are the key word here. Your bicycles, dirt bikes, hand dollies, wheelbarrows and jogging strollers with tubes are perfect candidates for the red label product."
I get the impression, and am doing more research into slime, but in a lot of these companies, the difference in the product line is more label and less chemical. but according to info I read about the three lines they have, red is for tubes, blue is for everything else except highway-speed vehicles and yellow is for highway-speed vehicles.
According to the Safety Data Sheets for the products, the three are identical, with the exception, MAYBE, of using different percentages of the three ingredients. Logically, I can see how a different amount of a chemical can make enough of a change to determine what type of tire we are fixing. So, after researching, I would stick to the red for a tube, blue for all tubeless non-highway speed vehicles and the yellow for highway speed. Let me know if I missed anything.