It's probably a paste with fine grit in it.If you don't think you'll use a tube that will do at least 2 dozen helmets don't bother.Get a grey 3M Scotchbrite pad and cut in 1/3rds length wise and fold a 1/3 in half.Wet it well with water and wet scuff it wiping it clean before it starts to dry.Use the 3 folded over sides to cram up against edges and the fold to get down in radiused areas if there are any.Don't use it dry though.When you're done rinse the residue off and solvent wipe to continue.I'd say it's the best thing since pizza and beer but it's not quite there.