I have restored a few hundred stocks over the years. For a typical Mossberg stock I suggest not over-complicating the issue.
What finish did it start life with, what does it have and what is your goal?
Most Mossberg's I see (vintage of course) have a common oil finish.
Without knowing what your stock has, what damage you are addressing, and what your goal is no one can efficiently help you, but many will tell you some of their favorite products that may or may not be useful to you.
I typically break stock work into a few buckets:
- Damage
- Current finish (does it need cleaning or removing)
- Stain/color
- New finish
Most stocks I work on get cleaned or stripped to bare wood (#2) and refreshed or new finish (#4).
I find traditional, common methods work best (a BLO scrub; 50%BLO, 50% turpentine or mineral spirits) for cleaning, water based degreaser to remove oil to bare wood (Purple Power/Citrus Cleaner), or a mild paint stripper (Citristrip) if there is some other finish needing to be removed.
I rarely stain but occasionally do.
My finish is usually a traditional oil (I prefer BLO but others are fine) and waxes (Gunny's Paste aka Tom's 1/3 mix;
https://thegunstockdoctor.com/).
I read Noremf's thoughts on Howard's feed and wax (and I strongly urge everyone to read them, and ALWAYS avoid any silicon products around firearms wood; no silicon spray or silicon gun socks are allowed in my shop). I took a common 10/22 stock and polished it with NuFinish and waxed with Howards, it came out great (for a worthless stock) so I did the same to one of my CZ 452s. But it is not a traditional military or American traditional oil finish.
Ruger and CZ polished with NuFinish and waxed with Howards Feed N Wax. It took 10 minutes tops per stock! A bit shiny for me but on these it's great. Click Clack was cleaned (purple power) to bare wood and treated with a few coats of BLO and a few coat's of Tom's 1/3 mix.
Neglected trade in Mossbergs:
Note 42MB has a stock chip held on with tape.
I got these for a great price, they looked like crap and were on the trade in rack in the local tactical gun store, no one was looking at them.
All I did to the Mossbergs was disassemble, clean and oil the metal. The socks were taken down to bare wood with purple power (no sanding, no harsh chemicals), a ew coats of 50/50 BLO/Turp and a few coats of 100% BLO. Done. The techniques for working on these are well known and have been used for many decades. The material is cheap and commonly available. If you are working on your own stocks do you really need some mystery wonder time saver elixir? While I look for ways to add efficiency (again, hundreds...) that is different from an unproven shortcut that does not say anything more specific on the can than "wood finishes" (guns or tables, rubbed oil, shellac, poly, varnish, what?)
I would like to test this wonder product and see what it's strengths and weaknesses are before I committed it to a nice stock (and most Mossberg stocks can easily be made to look pretty nice), until then I will stock with what is well known and easy.
CMP 40-X stock as received. Nice, with plenty of dentys and dings; signs of respectful use.
All I did was a deep scrub (several sessions with 50/50 BLO/Turp and a green scotchbrite) followed by 5-8 coats of BLO until it looked done. That works blends and evens out any normal dents and dings (It had no gouges/damage).
If I find some new worder product that looks as good or better but allows significantly less time/labor or $$ I will be all over it. But 8 coats of BLO is generally easy to tell from 2 coats, there aren't really shortcuts to that type of appearance.