OK, the raw fact that no one has thought of this ,or posted it makes me think that all the good members went to rx29a.
so to get started this is for a blasting cap but it could be scaled up for larger purposes,lets get started.
first ,this is made of things you probably have sitting next to you as your reading this.
materials:
printer paper
tape
a pencil
paraffin wax
a heat source
Procedure:
trim the paper a little over half way with wise.
take the sheet of paper and align it with the metal ring of your pencil.
roll the paper into a tube and tape it so it stays.
now you should notice about a half inch of empty space at the end ,if not move the pencil a little.
Now the delicate part .
"gently"fold in the end of the tube in on itself .
OK now hold it in your hand, eraser touching thumb,and smash the end on the desk,pull threepence out ,and heat up the wax.
once the wax is literally boiling hole the smashed end in you should do this several times to ensure it is sealed.
now your finished fill it with whatever you want organic peroxides ,boosters,hell even nitro the hot wax makes it water proof so have fun