Weapon Damage: Notches

Some new house rules, adapted from a post by Logan over at Last Gasp Grimoire. He suggested that weapons could take damage (a notch) when the player rolls a 1 or 2 to hit, breaking when they get as many notches as their maximum damage. I thought that was awesome as shit so I promptly stole the idea and ran with it.

Notches

A weapon can receive as many notches as its maximum damage. Eg: knife d4, 4 notches; battle axe d8/d10, 10 notches; flail 2d4, 8 notches.

Weapons receive a notch when the PC rolls equal to or below their Quality when attacking, bashing doors etc

Price modifications are just guidelines for the most basic weapons of each Quality rating.

Quality 5 - 50% price

Improvised weapons (spades, pick axes)

Corroded weapons

Quality 4 - 75% price

Poorly made weapons

Fragile materials (toughened glass, silver)

Quality 3 - 100% price

Average craftmanship

Average materials (iron, hardwood)

Quality 2 - 150% price

Well made

High quality materials (steel, blood iron)

Quality 1 - 200% price

Magical

Mastercrafted

Ultra rare materials (polymer, ceramic)

Examples
Obviously this can be used as steel long sword 30sp, rusty dagger sp etc, but here are some weapons that make use of the quality level.

Bloodiron Axe (Bloodiron idea stolen straight from Logan, seriously go read his site, it's cool as fuck)

d8/d10, Qual 2

Made from fallen meteorites bloodiron ranges from black to rust coloured. It drinks the life of the enemy in order to repair itself, visibly absorbing the blood.

On a critical repairs 1 notch of damage. 

Can be left to soak overnight in fresh blood (1 pint of blood for each point of max damage. Eg: knife d4, 4 pints etc) in order to repair d1/2 max damage of notches.

Ceramic Sword with Rotary Blade

d8, Qual 1

Ceramic weapons are a rarely found relic of a past civilisation, highly prized for their light weight and strength.

Razor sharp blade, +2 to hit

Rotary blade starts up automatically when pressed against something (exploding dice, on a damage roll of 8, roll again until you don't roll an 8)

Glass Dagger
d4, Qual 4

Glass weapons are often used by the nomads that wander the desert, making use of the deposits of broken glass that are found scattered among the moving sand.

This glass knife leave slivers in the wound that vibrate, causing further damage, +d3 damage in second round after hit vs organic

Edit: Forgot to add the part about random breaking as pointed out by Logan.

So after the weapons gets 2 notches roll 2d(damage die) after every attack, hit or miss. If the roll is equal to or less the no. of notches the weapons breaks in some suitably dramatic way, spear snapping off in the ribs of the sheep headed skeleton or sword shattering against the chitin of the Many Eyed Terror of Barloon.