I've used it and it seems pretty good on leadheads. I just used a candle to heat the lead for a few seconds then dipped it in the powder. You have to be careful not to heat for too long, especially with smaller jigs (1/32, 1/64), or the lead melts off. Don't forget to bake it afterwards as per the instructions.
I've seen it at the Sportsman's in Vernal and would suppose they would carry it at the other stores.