Three of the musicians that comprised DAEMON could boast a good deal of experience in other acts. Guitarist John Caan was ex-ATTACK, ATOMIC ROOSTER and ANDROMEDA, drummer Paul Hammond was also an erstwhile ATOMIC ROOSTER man, whilst bassist John Gustafson had previously been with EPISODE SIX, BIG THREE and QUATERMASS. The bassist later performed with GILLAN and guested on Swedish act BALTIK's 1973 eponymous album.

Gustafson, Caan and Hammond forged a short-lived band entitled DAEMON in 1971. Fronted by singer Al Shaw this unit recorded one now extremely scarce album 'The Entrance To Hell' before Shaw exited. The remaining band members stuck together and initially took on the title BULLET releasing one single, the first release for DEEP PURPLE's Purple label. However, threats of a lawsuit from an American band of the same name necessitated a name change to HARD STUFF for the 'Bulletproof' record of 1972. 'Bulletproof' was in fact a re-hash of the DAEMON album, featuring the same songs minus two tracks.