THE IDEAL THING IS..garden mines from the USA,for intruders,sheds etc,Kev a mate visited his girlfriend in flodida brought a magazine back. showing all these gizmo's,on sale..mail order!! you can fill em with paint/anything really,showed you a fella with overalls on standing on a mine in the doorway to the garage. the upward blast of the paint discharged..AWESOME,COVERED FROM HEAD TO FOOT,i kid you not.