Yeah, we have covered this ground before. I went around and bought quart cans of lacquer thinner from all the hardware stores , auto parts stores, and big box home improvement stores to to check them out and see what they were like. Almost everyone said "acetone" for the ingredients. This might be a regional thing. I remember when we could get DuPont 3608S thinner here in my area with no problem, and pretty reasonably priced. Back east, it was changed from an "S" to a "W" and it didn't work the same. DuPont is now called something else and I don't know what the hell they sell now! Somebody mentioned the Kleen Strip brand from Home Depot as working well with SIG dope and I have used that ever since when needed. This is just one of those instances where change isn't necessarily a good thing!!
Type at you later,
Dan McEntee
There are really two things going on, one is the "whack-a-mole" trying to dodge various local air quality officials, and, changing the formula based on what solvents are cheapest when they go to buy it. The latter is presumably why one batch of Brodak dope is incompatible with the previous batch or suddently stops being fuel-resistant and probably the same when Aero-Gloss "dope"/acrylic lacquer was still around.
So, what you get from day to day varies, unless is is a product from one of the large automotive finish suppliers. That's also why I think it is a really good idea to avoid counting on hardware-store and other uncontrolled/undocumented products.
Brett