I had to get the head resurfaced on my drz. When it was time for reinstalling the valves I went to buy some lapping compound. I had to goto 4 auto parts stores before I found any. At the last place -the clerk was actually excited to sell it to me. He said nobody every buys this stuff anymore. Is that true? Would the valves seat properly without it? Well, I used it anyway but I was curious as to what everyone else here does.