wow..thanks on advices :) , at first i didn't understand what tar is, but i learned...on croatian we call it "smola" or "katran" (Y) finding tar wasn't problem, i put some on rims and it brakes like hell, but not for a long time, later it brakes slightly weaker but still very good, better than without tar. i've take a photo of my brake: http://img414.imageshack.us/img414/2554/dsc017494cv.jpg
http://img414.imageshack.us/img414/8939/dsc017508aw.jpg
ill try to ask on heatsink.com about delivery, i hope that i won't be too expensive...