i wouldn't use it undiluted. Needs to be added to a base oil/gel.
We've found benzyl benzoate to be highly effective. Apply with a toothbrush and rub in well!! mine seem to rub their tails if the flies are bad or they are bored
My princess, Bonnie, 28/7/06 loved and missed by us all
16.5 inch wintec 500, brown, immaculate and barely used complete with 3 gullets and synthetic leathers, £150 ono excl postage