I`ve used different things over the years , I like soot the best but, rather than having to light an oil lamp or worse yet leave one burning in the shop, I use the cheap adjustable flame lighters . When the flame is up high it will soot a part perfectly , a very light coat. You don`t have to hold it under the part long at all ,not like your trying to cook it , just run it under it . I`ve used these for about 15 years and they`re cheap 5 in a pack for a dollar. I use an oil lamp for something big like a barrel ,but a buttplate can easily be done with a lighter. The most common mistake is overdoing whatever your using , these don`t do that. Nate