^an inch high of pb is a lottt.. maybe that's why u cook in the oven for 30 minutes, kuz it take longer to heat up all that pb.

i just smear enough to cover the surface of a cracker, then smear another layer so it's pretty thick. i guess i'd say like 1/3 inch high of pb when u sandwich the crackers together. i use exactly .3 grams on for each firecracker, but my crackers are pretty big. u should stick to about .2 grams for efficiency.

then, i bake it in the oven for 15 minutes at 350F. trust me, i've made at least 20 firecrackers in the past two months or so in this exact way, and never has it not worked. great highs every time, in fact.