Valspar is listing acetone and isobutyl acetate on the msds. From what you're saying, it isn't nitro.
Seems to be working fine, though.
Those are common solvents and used in both acrylic and nitro lacquers (and other paints.) But if it doesn't list nitrocellulose/cellulose acetate or butyl cellosolve (or one of the dozen other names its called), then is most likely not nitro. An MSDS needs to list every hazardous component of a particular product, and nitrocellulose certainly falls into that because it's highly flammable. On the other hand the acrylic resins used are fairly inert and harmless, so they're not always going to be on an MSDS unless the manufacturer decides to list them. Nitro is also dangerous to manufacture, so when you combine that with the lower toxicity of acrylic lacquer, it's no wonder most manufacturers aren't bothering to make nitro lacquer for consumers anymore. Of course there are still plenty of manufacturers on the pro/commercial side, it's just less convenient for us because it's no longer a matter of just hitting up the hardware store.
On a related note, I did discover that SprayMax's 1k clear is actually an acrylic lacquer (I assumed it was an enamel.) Considering the quality of their other products, it might be really good stuff and at $9 a can the price is right. If someone was interested in trying out various acrylic lacquers, I think it'd be a good one to check out. In fact, if I had the cash (or if someone wanted to donate materials), I'd be willing to buy several of the readily-available aerosol acrylic lacquers to test them. Maybe I should setup a crowdfunding thingy to make that happen .