having glycerine in the vial sounds quite a good idea. i'd not try the home made plastic explosive if i were you, a friend of mine was working in his lab the other day and he destroyed his fumehood, and i do mean destroyed, all the glasswear the works, mind you he was doing a reaction on a multi litre scale. he didn't realise that the reaction he was doing made the said explosive, which is extreamly shock sensitive.