How does it taste?
I wouldn't use that.
Those solids probably include what ever hardeners are in the oil.
Thereby taking hardeners away from the remaining oil.
Thereby making the remaining oil more difficult to harden/dry/cure properly.
.02
That stuff isn't expensive.
No wood project worth working on is worth taking the chance.
The last thing a person wants is a finish that won't fully cure. And by fully, I mean fully. Not just a surface cure.
Toss it and buy a fresh can.
Not worth saving $5 for new finish on a $1,000 gun. IMHO
Sorry for the thread jack....
I have a new CMP Stock on my Garand. Is oiling the stock required, or just for appearance?
As mentioned strain and test it on scrap. If it fully cures use it. If not pitch it and buy new. When you buy new also get a can of Bloxygen and squirt a little in the can before you seal it back up. I recommend a trip to Woodcraft for both.
Whoever mentioned driers, pure tung oil has no driers in it.