If you've ever tried to touch up the Knicks and scratches in your aluminum parts you'll know that painting looks like s***. I do a lot of resto jobs and fixing scratches and stuff in aluminum is easy if you have the right stuff. Get you a bottle of this stuff and it works wonders. Just dip a q-tip in it and it hold it on the scratch and dab it back and forth across it. It's a bluish tint liquid but it reacts with the aluminum and it'll cover those scratches and dings and look somewhat original. This stuff works amazingly and can bring a rough looking handguard back to life.