Abstract: Method and apparatus for wetting thread as it is being twisted in a double twist twisting spindle assembly, preferably by thread contact with the wettable guide or contacting surface formed by the inner wall of a balloon limiting mantle which encircles the twist spindle. The method essentially requires a liquid thread treating agent to be delivered or directed onto the thread contacting surface under regulated pressure impulses in an amount which provides a predetermined takeup of the liquid by the thread. Suitable apparatus includes dosing means wherein the pressure on the liquid can be alternately raised and lowered to create a regulated pattern of pressure impulses, for example by using a suitable impulse generator to regulate the pressure impulses. There is provided a more effective and controlled wetting of the double twisted threads.