Frank,
Your best bet is to get thinner for the material you are thinning. Spruce Aircraft has thinner for Butyrate and Nitrate thinner.

Best,    DennisT

 If you look at most commercially available ( hardware stores) lacquer thinner, and then look at the ingredients, most will say "100% Acetone." Many guys have used Klean Strip lacquer thinner from Home depot and such here with good results. Use the search function and read all about it. if you are satisfied after testing that it's OK, treat your gallon containers with a dash, then reseal the lids and store them upside down. Any air will go to the bottom of the can and the liquid inside seals off any other air leaking in.
  Type at you later,
   Dan McEntee

Frank,

I would not use straight acetone.

You should read this article on lacquer thinner which provides some good background.

https://thefinishingstore.com/understanding-solvents-part-iii-laquer-thinner/

Dave

              The cans that usually have dope or thinner in them pretty much suck. They leak regardless of how tight and this allows solvents to escape and air enter. I would reduce any head space in a can and make a additional gasket on the lid. Yellow folder or cardstock works well.

One fact more is essential about acetone: it is very hydrophile, when it is high amount in the solved lacquer, dope, etc. during spraying can get too much moisture from the air. It is very volatile, so the sprayed surface gets cool.
Most thinners contains at least 3-4 ingredients: esters (e.g. amylacetate, ethylacetate),  aromatics (cyclic hydrocarbons, e.g. toluene)...
Istvan

If the gallons haven't been opened, I wouldn't do anything to them except store them upside down.  I've used lacquer thinner to thin dope with great success, after reading about the Home Depo brand here.  But I've never attempted to use acetone.  I'm risk adverse as the price of dope goes up and availability goes down.

  The next time that you go into a regular hardware store or an auto parts store, just look at the can of their lacquer thinner. A few years ago I went around to several stores near me and bought quarts from them all just to check and test. It knew it would at least be useful for cleaning brushes. Each can I bought just said "Acetone" under the ingredients. And as some one else mentions, I have some other stuff and the Klean Strip that has added ingredients. That's the stuff I mix and thin dope with. I remember when i found out about DuPont 3608S lacquer thinner and it was much cheaper than SIG thinner at that time. Then in different parts of the country, it wasn't available as "3608S"and the last letter was changed to "W" I think. Windy called it out on one of his tapes. So you can have state regulations get in the way of what can or can't be sold. I just bought some from a lady on FB Marketplace. It works very well, has a ingredient listing that reads like Klean Strip, but on the label it is called "Brush Cleaner" and I think that was some one's way of getting around a regulation of rule some where along  the line. I sure miss the good old days!!
  Type at you later,
   Dan McEntee