I notice you said 2-3-4 coats of finish. To get one as slick as glass, I usually end up with 15-20 coats of finish on the wood, all rubbed out. I start off (on maple/ash) staining the stock at least 1 ir not 2 shades darker than I want it to end up.
First coat of finish is sloppy wet for then rub it ALL off with a paper towel. Next one same way til the wood shows me it is not absorbing any more finish. Then I start putting a ULTRA thin coat of Tru-Oil on and I am talking about just a fingerpring size area of my index finger wet & rub that into a 3-4" area til it is dry. Move over & do again, repeat til the entire stock is covered. Then when dry use 0000 steel wool & rub it all down. I keep doing this til I see all of the pores are filled I switch to 1000 grit paper from NAPA. Then do it again for about 5-6 coats. Then switch to 1500 paper for 3-5 coats, then finally 2000 paper for 2-3 coats. Then at the end I wax the heck out of it & it is like glass.
Allot of this depends on the wood, how hard it is, how porous it is, etc. On walnut after I do about the 3-4th coat I take a small piece of 600 paper & wet it with finish & sand the stock with it & that makes a slurry & helps fill the grain.
Now if you have carving, this is very tedious. On a plain rifle, I have several times spent as long finishing a rifle as I have building it....
I hope it is for yourself if you put one of these 40 hr finishes on it. Cause most buyers don't care & they will scratch it up just the same as a 8 hr finish....
Keith