It's a horrible idea.
One, corrosion. You'd have to be on top of it like white-on-rice.
Two, tolerances. Glocks are not target guns, of course. HOwever, you CAN hit with one...left stock.
Three, re-sale/trade. You'll TRASH that aspect of it.
There are numerous aftermarket finishes out there to make it 'whiter', light in appearance.
Hard-Chrome, or teflon-whatever, or even ceracoat. You just won't have the SHINE.