Re: Mossberg 500 "Matte" finish maintenance Please pickup a spray can of CLP and use that in conjunction with a quality gun oil instead of using WD40 only. While WD40 is a great product it isn't intended to be used standalone as it has ZERO lubricant properties to it. Its a water displacer plain and simple. Thus the recommendation of Mossberg to use the two. Don't think you can just use one or the other. Alot of folks do and choose the WD40 only. In the long term that is just going to setup you up for failure. WD40 works great as a penetrating oil. If something was neglected and rusted together it shines in that role really well but as a long term preservative it dries out quickly, turns kinda gummy and leaves little to no real protection. That is where you need to come back and give everything a nice thin coat of oil afterwards especially for long term storage. The beauty of CLP is that it applies more like WD40 out of the spray can and in most cases strong enough to be a penetrating product for crud/rusted/stubborn to remove parts. What it does that WD40 can't is continue to lubricate and preserve the parts you saturated with it. Its 2 birds with one stone. If you really feel the need to go back and oil certain parts ie friction points with a traditional gun oil it can't hurt especially on hard utilized working gun but usually CLP is more than sufficient if you just want to store the gun for a long period somewhere. My 2 cents. I've use it pretty religiously and have found it to be more convenient and beneficial than the WD40/traditional gun oil route. YMMV as usual.