i did a mix of shaving cream and laundry detergent and got some nice lines but there is still all that filler in between the lines....and jeffs didnt seem to have that...atleast not of the same color as the waves. thats why i was beginning to wonder if he squirted down general lines and did the press on them
My thought on this is that he would create the lines on another object and then transfer them to the disc. This should give you clean well defined lines as long as you get enough height on the veins before you transfer them.