I've used it and the instructions are pretty confusing aren't they! They say to use with water but equally can be used undiluted. I have tended to make up a batch in water (bought a soap pump dispenser from Sainsbury for about 75p) and use it 2 or 3 times a week on rug rubbed manes over winter. I don't think it stops it but I just hope that the little thats left is stronger. I have also used it straight - on bald knees! Funnily enough I did notice this morning that Ludo's mane looked good for this time of the year. Whilst it was still shorter where the rug has rubbed, is longer than it normally is for the time of year and seemed a bit thicker.
Generous squirt of megatek into a skooshy bottle full (1l) of water. Doesn't really matter the strength, it just so the hair's damp. It can go on to dry hair too but it's a bit thick to work in easily.