Id be leery of suggesting any hair care items for personal defense.
They may be handy & "legal" but they may also be flammable,
.
As some older TFLers may recall, singer/entertainer Michael Jackson had a serious injury on the set of a Pepsi cola ad in the late 1980s. His excessive hair care chemicals made his hair burn.
I also recall a scene in a 1970s era James Bond spy film where Roger Moore's 007 used a lighter & a spray can as a weapon.
You may say; "hey, that's some
Mythbusters type stuff but Id caution you.
A female police officer in the Daytona Beach FL area had a event where she hit a violent subject with a Taser weapon. The darts hit a cheap lighter in a shirt pocket & caused serious burns. The man later sued the police officer, the city & the PD for a huge amount of $$$.
Keep in mind, even in a use of force event, your actions & mindset will be under close scrutiny by the prosecutors & investigators.
Whether its a OC spray, a Taser, a can of bug spray, or a firearm.