Aerosol Can

"Hairspray may not seem like the most daunting weapon, but apply it to a cigarette lighter and you've got an instant flamethrower (don't try this at home). While its range is rather limited, its effectiveness is quite impressive. You can also light one up like a Molotov cocktail and toss it into a group of adversaries. Hit alt-fire a second time after igniting a can to drop it at your feet-it will explode once it burns down."

- Blood manual.

The  (or spray can) is a weapon from Blood. It is first found in the second episode Even Death May Die, around the first level Shipwrecked. Each can picked up is worth 48 in ammo.

Usage
The Aerosol can sprays a continuous stream of flames which can hit multiple enemies in a line and if enough is applied will set fire to them. This very effective on weaker enemies.

The alternate fire-mode allows the player to light up an entire can (using up 48 ammo or the remainder if there is less than 48 overall) and throw it as a projectile, which will explode in a burst of flames on impact, setting fire to weaker enemies. Like the Dynamite Bundle, the strength of throw will determine how far the Aerosol Can goes in the air. If the alternate fire-mode is activated a second time, the player will drop the lit can where Caleb is standing and it explodes in five seconds. The player will take fire damage if caught in the fiery explosion or makes impact with enemies on fire.

Trivia

 * Despite making its first appearance in the second episode, the 1997 trailer shows the weapon somehow being used in the House of Horrors level.