so i managed to put a decently long scratch down the side of my slide today. its not deep, just a surface scratch. do they make something i can apply to it to cover it up or hide it?
That slide is melonite (tenifer) which makes the slide very hard. What did you scratch it with - a diamond?
Mostly, what looks like scratches on Glock or M&P slides is the material flaked or rubbed off of whatever you scratched it against. It typically comes right off with a good solvent, scrub and "elbow grease."
One time, to my horror, a Glock armorer rubbed a nail as hard as he could back and forth against the slide. All it did was leave deposits from the nail on the slide. The nail was noticeably shorter. It scrubbed right off.
I do not know about S&W, but Glock formerly parkerized their slides after the tenifer QPQ metal treatment. They still do some kind of finish after the tenifer, and often that finish rubs off, but the slide does not lose its hardness or corrosion resistance since tenifer/melonite is not a "coating," but a QPQ metal treatment. Thus, while you may get discoloration from rubbing it against an abrasive of some type, you do not lose the hardness or corrosion resistance of the melonite/tenifer.*
*Melonite and tenifer are the same thing. See this site, which is the company that owns the process. It explains:
"MELONITE / QPQ
MELONITE, and its synonymous trade-name, Tufftride (or Tenifer), is a relatively straight-forward, flexible process to operate and maintain, and produces exceptionally uniform case hardening. The MELONITE process begins with the placement of parts in a re-circulating air preheat furnace, followed by immersion for 60-240 minutes in a molten nitrogen-rich salt solution contained in an aerated furnace. After nitriding, parts are treated in an oxidizing bath, water-cooled and rinsed.
An alternative series of post-nitriding steps involves a Quench-Polish-Quench (QPQ) sequence after liquid nitriding. For many applications, this finishing process provides a surface condition that protects against corrosion and wear better than hard chrome or nickel plating."
http://www.hefusa.net/melonite_qpq.html