MP-Pistol Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
1,522 Posts
Discussion Starter #1
Between the magic melonite finish, and the slide being stianless, you'd think it's be pretty rust proof.



Nope. Got little rust spots on mine. guess it got put away a bit damp after my match last weekend.



I'll post pics later before I try cleaning it up.
 

·
Registered
Joined
·
1,507 Posts
The from my understanding of the melonite process it does not make the stainless any less likely to rust just harder and more abrasion resistant.



Stainless will rust given the right circumstances, that is why it is called "stain less".



I am one of those guys that can get anything to rust. I have had several satinless gun that have rusted for me, but haven't managed to do it to my M&P yet.
 

·
Site Founder
Joined
·
2,889 Posts
I had the takedown lever get spots on it, but I killed it.



I have also understood that most of the time on stainless what rusts is the metal that has been machined(flakes) and lays in the pores of the metal.
 

·
Registered
Joined
·
1,522 Posts
Discussion Starter #4
Dan Burwell said:
I am one of those guys that can get anything to rust. I have had several satinless gun that have rusted for me, but haven't managed to do it to my M&P yet.


So is one of the guys I shoot with. I have the sneaking suspicion that he might have bumpedinto my gun while tearing down the match. It's all in a nice arc, and nothing inside, so I have my suspicions it was from touching. I don't usually have that problem.



Didn't no the melonite was not supposed to protect against corrosion.. if not, then what is it's purpose?
 

·
Registered
Joined
·
1,507 Posts
There is 3 types of melonite one type does offer corosion resistance but aparently does not work on stainless the other types dowork on stainless but do not increase the corosion resistance.



Here is a link to a company that does melonite finishing and they have excellent description of the properties.

http://www.burlingtoneng.com/melonite.html



The quick version: melonite makes the surface harder and slicker.



Dan
 

·
Registered
Joined
·
78 Posts
Rust Question

Gentlemen,

I love my M&P.40!!



I am in need of your expert opinioun. I have some stains on both sides of my slide. I hope it isn't rust stains. The stains are little and circular and are most noticible on the frame right above the bottom part of the slide just above the rails. I hope I am making sense.



I really like this pistol. I had some issues with it back in the summer and Smith and Wesson really came through for me. S&W put the new slide release on it, replaced the guide plug, and installed the factory Novak night sights without charging me!!!! That is good coustomer relations!! Now I want to buy a M&P 15.



I just don't know what to make of the stains on my slide. If they are stains at all, I first notice it when I got the pistol back from Smith. Believe me I am not complaining, I am very grateful for the Warrenty work S&W did on my pistol!!!



I suffered a really bad water leak in my Apartment back in June, Do you think that has anything to do with the stains on the slide?
 

·
Registered
Joined
·
1,522 Posts
Discussion Starter #7
If they are black circular/swirly blotches that are just a different shade than the rest of the black, then they are normal. I believe they are just an artifact of the melonite finishing process. Not sure though. Everybody's seems to have them, some more than others. If you really want a solid answer, post a picture of it.
 

·
Registered
Joined
·
78 Posts
Rust Question

Raz-0,

Thank you for the reply. It looks like what you have described, is on my pistol too. When I shine my flashlight on the right side of the slide the (Circular Stains/Bloches) get reflective like I am shining the light on the stainless steel, I think it is just more pronoucned on the right side of the slide. I do not have a cam. to post a pic.



I love this web page. I am new to the pistol world, I enjoy going to the range and shooting my pictols. I also have a SW5906, Walther P99 9mm, Beretta PX4 .40, SA G.I. .45, and CZ-75B 9mm.



I am looking forward to being a member here on this site.
 

·
Registered
Joined
·
107 Posts
I used to do a lot of work on experimental equipment for the food industry. It was all stainless that we made the equipment out of. We did not use any tooling on the stainless that had been used with steel . Molecules of the steel would get imbedded from the tools into the stainless and rust would form. The FDA sure didn't like rust! I try not to even use the same cleaning rag on my stainless guns that has been used on steel.
 

·
Registered
Joined
·
377 Posts
I have a friend who has an M&P and it has little rust dots all over the slide. What to do? Keeping a light coat of oil on it to prevent rust is easy, but how to get it off? My pistol has never had this problem, so I've never dealt with it.
 

·
Registered
Joined
·
1,522 Posts
Discussion Starter #11
MilitaryPower said:
I have a friend who has an M&P and it has little rust dots all over the slide. What to do? Keeping a light coat of oil on it to prevent rust is easy, but how to get it off? My pistol has never had this problem, so I've never dealt with it.


My rust spots came off after buffing it witha silicone impregnated cloth after dabbing some clp on them individually.
 

·
Registered
Joined
·
64 Posts
MilitaryPower said:
I have a friend who has an M&P and it has little rust dots all over the slide. What to do? Keeping a light coat of oil on it to prevent rust is easy, but how to get it off? My pistol has never had this problem, so I've never dealt with it.


I've always had great result using Sheath to remove rust as well as prevent it. If the rust is deep enough you have to scrub it out with an abrasive like brillo or sandpaper. I've done that before with brillow soaked in Sheath. It will affect the finish though so keep that in mind. It's an abrasive. Go figure. I fit's bad then consider a media blast from Burwell or a refinish from Bowie Tactical as options too.
 

·
Registered
Joined
·
201 Posts
Ok guys, here is what I (we) were told by SW about the rust. My PD issues the MP40 and a few officers here were having issues with rust, but the majority was not. Some of the officers this was happening to are pretty good about taking care of their gear, so this was kind of weird.



SW said that they believe is that after some machining/milling, shavings/flakes of metal/iron are still on the metal and the Melonite process is performed very quickly after the machining/milling. They believe, the shavings/flakes are getting trapped under the Melonite finish and that is what is rusting, not the actual metal on the slide.
 

·
Registered
Joined
·
78 Posts
The spots or dots on my slide are at the bottom of the slide and run up and down that location of the slide on both sides of the slide. They are silver in color and I think they might be the shavings left over from the production process. Is this what the old timers call Fisheyes? In any event they are bright siver in color when i shine my flashlight on them. I am not to worried about them. I have an MAP3###, so i am going to keep this pistol. Do you think it will be worth something one day? R/Jet
 
1 - 15 of 15 Posts
Top