i just use 6013 for low pen.
if no 6013.. then some fast freeze or stuff good for OOP would work. just use low amps.. dont want to weld the race to the housing.. :) just a lil bead around the face.. and lower in a bit where some thickness is. when she cools.. she will draw. some 'fall' rige out when inverted and tapped on a table after a few minutes.